diff --git a/src/KeyKeeper/ViewModels/RepositoryWindowViewModel.cs b/src/KeyKeeper/ViewModels/RepositoryWindowViewModel.cs
index d576097..48fab08 100644
--- a/src/KeyKeeper/ViewModels/RepositoryWindowViewModel.cs
+++ b/src/KeyKeeper/ViewModels/RepositoryWindowViewModel.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Threading.Tasks;
+using Avalonia.Threading;
 using KeyKeeper.PasswordStore;
 using static KeyKeeper.PasswordStore.FileFormatConstants;
 
@@ -7,8 +8,13 @@ namespace KeyKeeper.ViewModels;
 
 public partial class RepositoryWindowViewModel : ViewModelBase
 {
+    private static readonly TimeSpan LockTimeout = TimeSpan.FromMinutes(5);
+
     private object currentPage;
     private IPassStore passStore;
+    private DispatcherTimer? _lockTimer;
+    private DateTime _timerStart;
+    private string _lockTimerDisplay = string.Empty;
 
     public Func<string, Task> ShowErrorPopup;
 
@@ -18,6 +24,12 @@ public partial class RepositoryWindowViewModel : ViewModelBase
         set { currentPage = value; OnPropertyChanged(nameof(CurrentPage)); }
     }
 
+    public string LockTimerDisplay
+    {
+        get => _lockTimerDisplay;
+        private set { _lockTimerDisplay = value; OnPropertyChanged(nameof(LockTimerDisplay)); }
+    }
+
     public RepositoryWindowViewModel(IPassStore store)
     {
         passStore = store;
@@ -32,15 +44,72 @@ public partial class RepositoryWindowViewModel : ViewModelBase
             SwitchToLocked();
     }
 
+    /// <summary>
+    /// Сбрасывает таймер блокировки (вызывается при любой активности пользователя).
+    /// </summary>
+    public void ResetLockTimer()
+    {
+        if (_lockTimer != null && _lockTimer.IsEnabled)
+            _timerStart = DateTime.UtcNow;
+    }
+
     private void SwitchToUnlocked()
     {
         var directory = passStore.GetGroupByType(GROUP_TYPE_DEFAULT)
             ?? passStore.GetRootDirectory();
         CurrentPage = new UnlockedRepositoryViewModel(passStore, directory);
+        StartLockTimer();
     }
 
     private void SwitchToLocked()
     {
+        StopLockTimer();
         CurrentPage = new LockedRepositoryViewModel(passStore, this);
     }
-}
\ No newline at end of file
+
+    public void StartLockTimer()
+    {
+        StopLockTimer();
+        _timerStart = DateTime.UtcNow;
+        _lockTimer = new DispatcherTimer
+        {
+            Interval = TimeSpan.FromSeconds(1)
+        };
+        _lockTimer.Tick += OnLockTimerTick;
+        _lockTimer.Start();
+        UpdateTimerDisplay();
+    }
+
+    public void StopLockTimer()
+    {
+        if (_lockTimer != null)
+        {
+            _lockTimer.Tick -= OnLockTimerTick;
+            _lockTimer.Stop();
+            _lockTimer = null;
+        }
+        LockTimerDisplay = string.Empty;
+    }
+
+    private void OnLockTimerTick(object? sender, EventArgs e)
+    {
+        var elapsed = DateTime.UtcNow - _timerStart;
+        var remaining = LockTimeout - elapsed;
+
+        if (remaining <= TimeSpan.Zero)
+        {
+            StopLockTimer();
+            passStore.Lock();
+            UpdateLockStatus();
+            return;
+        }
+
+        UpdateTimerDisplay(remaining);
+    }
+
+    private void UpdateTimerDisplay(TimeSpan? remaining = null)
+    {
+        var r = remaining ?? LockTimeout;
+        LockTimerDisplay = $"{r:mm\\:ss}";
+    }
+}
diff --git a/src/KeyKeeper/Views/RepositoryWindow.axaml b/src/KeyKeeper/Views/RepositoryWindow.axaml
index e407c8d..126c690 100644
--- a/src/KeyKeeper/Views/RepositoryWindow.axaml
+++ b/src/KeyKeeper/Views/RepositoryWindow.axaml
@@ -4,7 +4,7 @@
         xmlns:i="using:Avalonia.Interactivity"
         xmlns:kkp="using:KeyKeeper.Views"
         x:Class="KeyKeeper.Views.RepositoryWindow"
-		Closing="RepositoryWindow_Closing"
+    Closing="RepositoryWindow_Closing"
         Title="KeyKeeper - Password store"
         CanResize="False"
         Width="800"
@@ -12,36 +12,59 @@
         Background="White"
         x:DataType="vm:RepositoryWindowViewModel">
 
-	<Window.DataTemplates>
-		<DataTemplate DataType="{x:Type vm:UnlockedRepositoryViewModel}">
-			<Grid>
-				<!-- Синий левый край -->
-				<Border Width="200"
+  <Window.DataTemplates>
+    <DataTemplate DataType="{x:Type vm:UnlockedRepositoryViewModel}">
+      <Grid>
+        <!-- Синий левый край -->
+        <Border Width="200"
                         Background="#2328C4"
                         HorizontalAlignment="Left"
                         VerticalAlignment="Stretch"/>
-				<StackPanel Margin="20" HorizontalAlignment="Left">
-					<!-- Надпись KeyKeeper -->
-					<TextBlock Text="KeyKeeper"
+        <StackPanel Margin="20" HorizontalAlignment="Left">
+          <!-- Надпись KeyKeeper -->
+          <TextBlock Text="KeyKeeper"
                                FontSize="32"
                                FontWeight="Bold"
                                HorizontalAlignment="Left"
                                Margin="0,0,0,20"/>
 
+                        <!-- Таймер блокировки под надписью KeyKeeper -->
+                        <Border Background="#CC000000"
+                                CornerRadius="6"
+                                Padding="8,4"
+                                HorizontalAlignment="Left"
+                                Margin="0,0,0,12"
+                                IsVisible="{Binding $parent[Window].DataContext.LockTimerDisplay,
+                                            Converter={x:Static StringConverters.IsNotNullOrEmpty}}">
+                            <StackPanel Orientation="Horizontal" Spacing="6" VerticalAlignment="Center">
+                                <!-- Иконка замка (Material Design lock outline) -->
+                                <Path Fill="White"
+                                      VerticalAlignment="Center"
+                                      Width="13" Height="13"
+                                      Stretch="Uniform"
+                                      Data="M18 8h-1V6c0-2.76-2.24-5-5-5S7 3.24 7 6v2H6c-1.1 0-2 .9-2 2v10c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V10c0-1.1-.9-2-2-2zm-6 9c-1.1 0-2-.9-2-2s.9-2 2-2 2 .9 2 2-.9 2-2 2zm3.1-9H8.9V6c0-1.71 1.39-3.1 3.1-3.1 1.71 0 3.1 1.39 3.1 3.1v2z"/>
+                                <TextBlock Text="{Binding $parent[Window].DataContext.LockTimerDisplay}"
+                                           Foreground="White"
+                                           FontSize="13"
+                                           FontWeight="SemiBold"
+                                           VerticalAlignment="Center"/>
+                            </StackPanel>
+                        </Border>
+
                         <!-- Рамочка  -->
-						<!-- <Border BorderBrush="Gray" 
+            <!-- <Border BorderBrush="Gray" 
                                 BorderThickness="1" 
                                 CornerRadius="5"
                                 Padding="20"
                                 Background="#F5F5F5"
                                 HorizontalAlignment="Left">
 
-						<StackPanel HorizontalAlignment="Left">
-							<Button Content="All Passwords"
+            <StackPanel HorizontalAlignment="Left">
+              <Button Content="All Passwords"
                                     Width="120"
                                     Height="30"
                                     HorizontalAlignment="Left"/>
-						</StackPanel>
+            </StackPanel>
 
                         </Border> -->
                         <!-- Save Passwords -->
@@ -52,93 +75,93 @@
                                 HorizontalAlignment="Left"
                                 Margin="0,20,0,0"/>
 
-					<!-- New Entry -->
-					<Button Content="New Entry"
+          <!-- New Entry -->
+          <Button Content="New Entry"
                             Classes="accentSidebarButton"
                             Click="AddEntryButton_Click"
                             Height="30"
                             HorizontalAlignment="Left"
                             Margin="0,20,0,0"/>
 
-					<!-- Edit Selected Entry -->
-					<Button Content="Edit Selected Entry"
+          <!-- Edit Selected Entry -->
+          <Button Content="Edit Selected Entry"
                             Classes="accentSidebarButton"
                             Click="EditEntryButton_Click"
                             Height="30"
                             HorizontalAlignment="Left"
                             Margin="0,20,0,0"/>
-				</StackPanel>
+        </StackPanel>
 
-				<!-- ListBox с паролями -->
-				<ListBox x:Name="PasswordsListBox"
+        <!-- ListBox с паролями -->
+        <ListBox x:Name="PasswordsListBox"
                          Width="580"
                          Margin="210 10 10 10"
                          ItemsSource="{Binding Passwords}"
                          Background="Transparent"
                          SelectionMode="Single">
-					<ListBox.ItemsPanel>
-						<ItemsPanelTemplate>
-							<WrapPanel Orientation="Horizontal" />
-						</ItemsPanelTemplate>
-					</ListBox.ItemsPanel>
+          <ListBox.ItemsPanel>
+            <ItemsPanelTemplate>
+              <WrapPanel Orientation="Horizontal" />
+            </ItemsPanelTemplate>
+          </ListBox.ItemsPanel>
 
-					<ListBox.ItemTemplate>
-						<DataTemplate>
-							<Border Background="Transparent" DoubleTapped="Entry_DoubleTapped">
-								<StackPanel Width="100"
+          <ListBox.ItemTemplate>
+            <DataTemplate>
+              <Border Background="Transparent" DoubleTapped="Entry_DoubleTapped">
+                <StackPanel Width="100"
                                             Margin="10"
                                             HorizontalAlignment="Center">
-									<Svg Path="{Binding IconPath}" Width="48" Height="48"/>
-									<TextBlock Text="{Binding Name}"
+                  <Svg Path="{Binding IconPath}" Width="48" Height="48"/>
+                  <TextBlock Text="{Binding Name}"
                                                HorizontalAlignment="Center"
                                                Foreground="Black" />
-									<TextBlock Text="{Binding Username.Value}"
+                  <TextBlock Text="{Binding Username.Value}"
                                                Foreground="#666"
                                                HorizontalAlignment="Center" />
-								</StackPanel>
-								<Border.ContextMenu>
-									<ContextMenu>
-										<MenuItem Name="entryCtxMenuCopyUsername" Header="Copy username" Click="EntryContextMenuItem_Click"/>
-										<MenuItem Name="entryCtxMenuCopyPassword" Header="Copy password" Click="EntryContextMenuItem_Click"/>
-										<!-- Новый пункт меню "Edit" -->
-										<MenuItem Name="entryCtxMenuEdit" Header="Edit" Click="EntryContextMenuItem_Click"/>
-										<MenuItem Name="entryCtxMenuDelete" Header="Delete" Click="EntryContextMenuItem_Click"/>
-									</ContextMenu>
-								</Border.ContextMenu>
-							</Border>
-						</DataTemplate>
-					</ListBox.ItemTemplate>
-				</ListBox>
+                </StackPanel>
+                <Border.ContextMenu>
+                  <ContextMenu>
+                    <MenuItem Name="entryCtxMenuCopyUsername" Header="Copy username" Click="EntryContextMenuItem_Click"/>
+                    <MenuItem Name="entryCtxMenuCopyPassword" Header="Copy password" Click="EntryContextMenuItem_Click"/>
+                    <!-- Новый пункт меню "Edit" -->
+                    <MenuItem Name="entryCtxMenuEdit" Header="Edit" Click="EntryContextMenuItem_Click"/>
+                    <MenuItem Name="entryCtxMenuDelete" Header="Delete" Click="EntryContextMenuItem_Click"/>
+                  </ContextMenu>
+                </Border.ContextMenu>
+              </Border>
+            </DataTemplate>
+          </ListBox.ItemTemplate>
+        </ListBox>
 
-				<kkp:ToastNotificationHost x:Name="NotificationHost"
+        <kkp:ToastNotificationHost x:Name="NotificationHost"
                                             HorizontalAlignment="Center"
                                             VerticalAlignment="Center"
                                             Margin="20"
                                             Duration="0:0:2" />
-			</Grid>
-		</DataTemplate>
+      </Grid>
+    </DataTemplate>
 
-		<DataTemplate DataType="{x:Type vm:LockedRepositoryViewModel}">
-			<StackPanel Margin="20"
+    <DataTemplate DataType="{x:Type vm:LockedRepositoryViewModel}">
+      <StackPanel Margin="20"
                         HorizontalAlignment="Center"
                         VerticalAlignment="Center"
                         Spacing="10">
-				<TextBlock Text="Enter credentials to unlock"
+        <TextBlock Text="Enter credentials to unlock"
                            Foreground="#2328C4"
                            FontSize="32" />
 
-				<TextBox x:Name="UnlockPasswordEdit"
+        <TextBox x:Name="UnlockPasswordEdit"
                          Text="{Binding UnlockPassword, Mode=TwoWay}"
                          PasswordChar="*"
                          Width="450" />
 
-				<Button x:Name="UnlockButton"
+        <Button x:Name="UnlockButton"
                         Command="{Binding TryUnlock}"
                         HorizontalAlignment="Center"
                         Content="Unlock!" />
-			</StackPanel>
-		</DataTemplate>
-	</Window.DataTemplates>
+      </StackPanel>
+    </DataTemplate>
+  </Window.DataTemplates>
 
-	<ContentControl Content="{Binding CurrentPage}"/>
-</Window>
\ No newline at end of file
+  <ContentControl Content="{Binding CurrentPage}"/>
+</Window>
diff --git a/src/KeyKeeper/Views/RepositoryWindow.axaml.cs b/src/KeyKeeper/Views/RepositoryWindow.axaml.cs
index bc3824c..6e39894 100644
--- a/src/KeyKeeper/Views/RepositoryWindow.axaml.cs
+++ b/src/KeyKeeper/Views/RepositoryWindow.axaml.cs
@@ -28,6 +28,15 @@ public partial class RepositoryWindow : Window
     protected override void OnOpened(EventArgs e)
     {
         base.OnOpened(e);
+        AddHandler(PointerMovedEvent, OnUserActivity, RoutingStrategies.Tunnel);
+        AddHandler(PointerPressedEvent, OnUserActivity, RoutingStrategies.Tunnel);
+        AddHandler(KeyDownEvent, OnUserActivity, RoutingStrategies.Tunnel);
+    }
+
+    private void OnUserActivity(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is RepositoryWindowViewModel vm)
+            vm.ResetLockTimer();
     }
 
     private async void RepositoryWindow_Closing(object? sender, WindowClosingEventArgs e)
@@ -77,8 +86,13 @@ public partial class RepositoryWindow : Window
         if (DataContext is RepositoryWindowViewModel vm_ && vm_.CurrentPage is UnlockedRepositoryViewModel vm)
         {
             EntryEditWindow dialog = new();
+
+            vm_.StopLockTimer();
+
             await dialog.ShowDialog(this);
 
+            vm_.StartLockTimer();
+
             if (dialog.EditedEntry != null)
                 vm.AddEntry(dialog.EditedEntry);
         }
@@ -104,8 +118,13 @@ public partial class RepositoryWindow : Window
 
             EntryEditWindow dialog = new();
             dialog.SetEntry(selectedEntry);
+
+            vm_.StopLockTimer();
+
             await dialog.ShowDialog(this);
 
+            vm_.StartLockTimer();
+
             if (dialog.EditedEntry != null)
             {
                 vm.UpdateEntry(dialog.EditedEntry);
@@ -151,7 +170,9 @@ public partial class RepositoryWindow : Window
                 {
                     EntryEditWindow dialog = new();
                     dialog.SetEntry(pwd);
+                    vm.StopLockTimer();
                     await dialog.ShowDialog(this);
+                    vm.StartLockTimer();
                     if (dialog.EditedEntry != null)
                     {
                         pageVm.UpdateEntry(dialog.EditedEntry);
@@ -202,4 +223,4 @@ public static class VisualTreeExtensions
 
         return null;
     }
-}
\ No newline at end of file
+}