diff --git a/assets/sounds/door_locked.wav b/assets/sounds/door_locked.wav
new file mode 100644
index 0000000..f26955d
Binary files /dev/null and b/assets/sounds/door_locked.wav differ
diff --git a/src/common/version.h b/src/common/version.h
index 3c95f2c..56426bf 100755
--- a/src/common/version.h
+++ b/src/common/version.h
@@ -4,7 +4,7 @@
 /* Auto generated version file. DO NOT MODIFY */
 #define SYMMETRY_VERSION_MAJOR 0
 #define SYMMETRY_VERSION_MINOR 1
-#define SYMMETRY_VERSION_REVISION 348
+#define SYMMETRY_VERSION_REVISION 349
 #define SYMMETRY_VERSION_BRANCH "dev"
 
 #endif
\ No newline at end of file
diff --git a/src/game/door.c b/src/game/door.c
index 38a1d5b..7975ad1 100644
--- a/src/game/door.c
+++ b/src/game/door.c
@@ -84,6 +84,16 @@ void door_update(struct Door* door, struct Scene* scene, float dt)
 				sound_source_buffer_set(game_state->sound, door->sound, "sounds/door_open.wav", ST_WAV);
 				sound_source_play(game_state->sound, door->sound);
 			}
+			else
+			{
+				// Player does not have the right keys so the door is locked
+				if(!door->lock_sound_played && sound_source_is_paused(game_state->sound, door->sound))
+				{
+					sound_source_buffer_set(game_state->sound, door->sound, "sounds/door_locked.wav", ST_WAV);
+					sound_source_play(game_state->sound, door->sound);
+					door->lock_sound_played = true;
+				}
+			}
 		}
 		break;
 	case DOOR_OPEN:
@@ -107,6 +117,9 @@ void door_update(struct Door* door, struct Scene* scene, float dt)
 			door->state = DOOR_CLOSED;
 		break;
 	}
+
+	if(!door->trigger->triggered)
+		door->lock_sound_played = false;
 }
 
 void door_update_key_indicator_materials(struct Door* door)
@@ -180,4 +193,4 @@ void door_on_trigger(struct Event* event, void* door_ptr)
 	case DOOR_CLOSING:
 		break;
 	}
-}
+} 
\ No newline at end of file
diff --git a/src/game/entity.h b/src/game/entity.h
index d035545..5d49457 100755
--- a/src/game/entity.h
+++ b/src/game/entity.h
@@ -265,6 +265,7 @@ struct Door
 	float                speed;
 	float                open_position;
 	float                close_position;
+	bool                 lock_sound_played;
 	struct Static_Mesh*  mesh;
 	struct Static_Mesh*  key_indicator_red;
 	struct Static_Mesh*  key_indicator_green;
diff --git a/todo.txt b/todo.txt
index 51b69f6..48b4ece 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,7 +1,4 @@
 Todo:
-	- RGB keys to progress to next level
-	- Visual indicator on doors corresponding to their key masks
-	- Audio cues when player does not have the right key combination to open a particular door
 	- Player/enemies getting hit by bullets
 	- Win/fail States
 	- Remove excessive repitition in scene and editor code that handles multiple entity types
@@ -421,4 +418,7 @@ Done:
 	* Switched transformation in property inspector to show/modify local transform values by default and show absolute transform values as read-only.
 	* Doors that open using the red/green/blue keys only as a way of progressing the level or cordoing off certain sections
 	* Implemented player footstep sounds for walking, running and jumping
-	* Player jump cooldown, don't allow jump until a certian time interval has passed, even if we're grounded
\ No newline at end of file
+	* Player jump cooldown, don't allow jump until a certian time interval has passed, even if we're grounded
+	* RGB keys to progress to next level
+	* Visual indicator on doors corresponding to their key masks
+	* Audio cues when player does not have the right key combination to open a particular door
\ No newline at end of file