Why is the key to door script not working to me?

[The chaser]

void OnStart()

{

AddUseItemCallback("", "key", "locked_door1", "UsedKeyOnDoor", true);

SetEntityCallbackFunc("key", "OnPickup");

}

void UsedKeyOnDoor(string &in asItem, string &in asEntity)

{

SetSwingDoorLocked("locked_door1", false, true);

PlaySoundAtEntity("", "unlock_door.snt", "locked_door1", 0, false);

RemoveItem("key");

}

void OnPickup(string &in asEntity, string &in type)

{

SetEntityActive("servant_grunt_1", true);

ShowEnemyPlayerPosition("servant_grunt_1");

}

There, I think it should work now.