diff --git a/server/src/collection.rs b/server/src/collection.rs
index 42f4679f..73c70c04 100644
--- a/server/src/collection.rs
+++ b/server/src/collection.rs
@@ -109,9 +109,9 @@ impl Collection {
     ) -> zbus::Result<()>;
 
     #[zbus(signal, name = "ItemChanged")]
-    async fn item_changed(
+    pub async fn item_changed(
         signal_emitter: &SignalEmitter<'_>,
-        item: OwnedObjectPath,
+        item: &OwnedObjectPath,
     ) -> zbus::Result<()>;
 }
 
@@ -157,6 +157,26 @@ impl Collection {
         self.alias.lock().await.clone()
     }
 
+    pub async fn inner_items(&self) -> Vec<item::Item> {
+        self.items.lock().await.to_vec()
+    }
+
+    pub async fn locked_updated(&self) -> Result<(), ServiceError> {
+        let manager = self.manager.lock().await;
+        let signal_emitter = manager.signal_emitter(self.path.clone())?;
+        self.locked_changed(&signal_emitter).await?;
+
+        Ok(())
+    }
+
+    pub async fn set_locked(&self, locked: bool) -> Result<(), ServiceError> {
+        self.locked
+            .store(locked, std::sync::atomic::Ordering::Relaxed);
+        self.locked_updated().await?;
+
+        Ok(())
+    }
+
     pub async fn dispatch_items(&self) -> Result<(), Error> {
         let keyring_items = self.keyring.items().await;
         let mut items = self.items.lock().await;
diff --git a/server/src/item.rs b/server/src/item.rs
index 38b832cf..51f50dd2 100644
--- a/server/src/item.rs
+++ b/server/src/item.rs
@@ -12,7 +12,7 @@ use oo7::{
 use tokio::sync::Mutex;
 use zbus::zvariant::{ObjectPath, OwnedObjectPath};
 
-use crate::service_manager::ServiceManager;
+use crate::{collection::Collection, service_manager::ServiceManager};
 
 #[derive(Debug, Clone)]
 pub struct Item {
@@ -20,7 +20,8 @@ pub struct Item {
     locked: Arc<AtomicBool>,
     inner: Arc<Mutex<oo7::portal::Item>>,
     // Other attributes
-    _manager: Arc<Mutex<ServiceManager>>,
+    manager: Arc<Mutex<ServiceManager>>,
+    collection_path: OwnedObjectPath,
     path: OwnedObjectPath,
 }
 
@@ -93,12 +94,31 @@ impl Item {
         Self {
             locked: Arc::new(AtomicBool::new(locked)),
             inner: Arc::new(Mutex::new(item)),
+            collection_path: collection_path.clone(),
             path: OwnedObjectPath::try_from(format!("{}/{}", collection_path, item_index)).unwrap(),
-            _manager: manager,
+            manager,
         }
     }
 
     pub fn path(&self) -> &OwnedObjectPath {
         &self.path
     }
+
+    pub async fn locked_updated(&self) -> Result<(), ServiceError> {
+        let manager = self.manager.lock().await;
+        let signal_emitter = manager.signal_emitter(self.path.clone())?;
+        self.locked_changed(&signal_emitter).await?;
+        let signal_emitter = manager.signal_emitter(self.collection_path.clone())?;
+        Collection::item_changed(&signal_emitter, &self.path).await?;
+
+        Ok(())
+    }
+
+    pub async fn set_locked(&self, locked: bool) -> Result<(), ServiceError> {
+        self.locked
+            .store(locked, std::sync::atomic::Ordering::Relaxed);
+        self.locked_updated().await?;
+
+        Ok(())
+    }
 }
diff --git a/server/src/service.rs b/server/src/service.rs
index 3fa483b5..57b3d473 100644
--- a/server/src/service.rs
+++ b/server/src/service.rs
@@ -99,9 +99,34 @@ impl Service {
     #[zbus(out_args("locked", "prompt"))]
     pub async fn lock(
         &mut self,
-        _objects: Vec<OwnedObjectPath>,
+        objects: Vec<OwnedObjectPath>,
+        #[zbus(signal_emitter)] signal_emitter: SignalEmitter<'_>,
     ) -> Result<(Vec<OwnedObjectPath>, ObjectPath), ServiceError> {
-        todo!()
+        let mut locked: Vec<OwnedObjectPath> = Vec::new();
+        let prompt = ObjectPath::default();
+        let collections = self.collections.lock().await;
+
+        for object in &objects {
+            for collection in collections.iter() {
+                if object == collection.path() || collection.items().await.contains(object) {
+                    for item in collection.inner_items().await {
+                        if !item.is_locked().await {
+                            item.set_locked(true).await?;
+                        }
+                    }
+                    if !collection.is_locked().await {
+                        collection.set_locked(true).await?;
+                    }
+                    locked.push(object.clone());
+                    Self::collection_changed(&signal_emitter, collection.path()).await?;
+                    tracing::info!("Object: {} is locked.", object);
+                    break;
+                }
+                tracing::info!("Object: {} does not exist.", object);
+            }
+        }
+
+        Ok((locked, prompt))
     }
 
     #[zbus(out_args("secrets"))]
@@ -182,7 +207,7 @@ impl Service {
     #[zbus(signal, name = "CollectionChanged")]
     async fn collection_changed(
         signal_emitter: &SignalEmitter<'_>,
-        collection: OwnedObjectPath,
+        collection: &OwnedObjectPath,
     ) -> zbus::Result<()>;
 }
 
diff --git a/server/src/service_manager.rs b/server/src/service_manager.rs
index 5435d8f0..e25512ee 100644
--- a/server/src/service_manager.rs
+++ b/server/src/service_manager.rs
@@ -25,6 +25,15 @@ impl ServiceManager {
         self.connection.object_server()
     }
 
+    pub fn signal_emitter(
+        &self,
+        path: OwnedObjectPath,
+    ) -> Result<zbus::object_server::SignalEmitter, oo7::dbus::ServiceError> {
+        let signal_emitter = zbus::object_server::SignalEmitter::new(&self.connection, path)?;
+
+        Ok(signal_emitter)
+    }
+
     pub fn n_sessions(&self) -> usize {
         self.sessions.len()
     }