diff --git a/crates/engine/src/cmd/anim.rs b/crates/engine/src/cmd/anim.rs
index 76bfb5a63..1aecf3b5d 100644
--- a/crates/engine/src/cmd/anim.rs
+++ b/crates/engine/src/cmd/anim.rs
@@ -498,7 +498,13 @@ fn time_reverse(s: &mut Session, _: &Value) -> Result<Value> {
         }
         let mut new_sel = vec![];
         for ((lid, uid), times) in groups {
-            let Some(pr) = comp.layer_mut(lid).and_then(|l| l.props.find_mut(uid)) else { continue };
+            let Some(layer) = comp.layer_mut(lid) else { continue };
+            // A locked layer's keys stay as they are, and stay selected.
+            if layer.switches.locked {
+                new_sel.extend(times.iter().map(|time| KeyRef { layer: lid, prop: uid, time: *time }));
+                continue;
+            }
+            let Some(pr) = layer.props.find_mut(uid) else { continue };
             let (mut picked, rest): (Vec<Keyframe>, Vec<Keyframe>) = pr.keys.drain(..).partition(|k| times.contains(&k.time));
             effectcraft_keyframe::time_reverse(&mut picked);
             new_sel.extend(picked.iter().map(|k| KeyRef { layer: lid, prop: uid, time: k.time }));
diff --git a/crates/engine/src/cmd/prop.rs b/crates/engine/src/cmd/prop.rs
index 36f76706f..0eff1dd09 100644
--- a/crates/engine/src/cmd/prop.rs
+++ b/crates/engine/src/cmd/prop.rs
@@ -895,7 +895,16 @@ pub(crate) fn edit_keys(s: &mut Session, label: &str, merge: Option<&str>, f: im
             groups.entry((k.layer, k.prop)).or_default().push(k.time);
         }
         for ((lid, uid), times) in groups {
-            let Some(pr) = comp.layer_mut(lid).and_then(|l| l.props.find_mut(uid)) else { continue };
+            let Some(layer) = comp.layer_mut(lid) else { continue };
+            // A locked layer's keys stay as they are, and stay selected.
+            if layer.switches.locked {
+                for time in times {
+                    let r = KeyRef { layer: lid, prop: uid, time };
+                    remapped.insert(r, r);
+                }
+                continue;
+            }
+            let Some(pr) = layer.props.find_mut(uid) else { continue };
             // Process each stored key once, in an order that avoids collisions when moving.
             let mut idx: Vec<(usize, Tick)> = times.iter().filter_map(|t| key_at(&pr.keys, *t).map(|i| (i, *t))).collect();
             idx.sort_by_key(|x| x.0);
diff --git a/crates/engine/src/tests/delete_keys.rs b/crates/engine/src/tests/delete_keys.rs
index 029104497..829331fd7 100644
--- a/crates/engine/src/tests/delete_keys.rs
+++ b/crates/engine/src/tests/delete_keys.rs
@@ -64,3 +64,23 @@ fn a_locked_layers_keys_cannot_be_deleted_or_edited() {
     s.execute_checked("keys.set", json!({"layer": layer, "prop": prop, "time": 0, "value": 90})).unwrap();
     assert_eq!(s.execute_checked("keys.delete", json!({})).unwrap(), json!(3));
 }
+
+/// Easy Ease, Toggle Hold and Time-Reverse leave a locked layer's keys as they are and keep them
+/// selected; unlocked, they change them.
+#[test]
+fn selection_based_key_edits_skip_a_locked_layer() {
+    let (mut s, layer, prop) = setup();
+    let keys = keys_of(&s, layer, prop);
+    let stored = |s: &Session| s.active_comp().unwrap().layer(LayerId(layer)).unwrap().props.find(prop).unwrap().keys.clone();
+    let before = stored(&s);
+    s.state.selected_keys = keys.clone();
+    s.execute_checked("layer.setSwitch", json!({"layers": [layer], "switch": "locked", "value": true})).unwrap();
+    for command in ["keys.easyEase", "keys.toggleHold", "keys.timeReverse"] {
+        s.execute_checked(command, json!({})).unwrap();
+        assert_eq!(stored(&s), before, "{command} changed a locked layer's keys");
+        assert_eq!(s.state.selected_keys, keys, "{command} dropped the selection of a locked layer's keys");
+    }
+    s.execute_checked("layer.setSwitch", json!({"layers": [layer], "switch": "locked", "value": false})).unwrap();
+    s.execute_checked("keys.easyEase", json!({})).unwrap();
+    assert_ne!(stored(&s), before, "unlocked, Easy Ease changes the keys");
+}