Script help for level door

[afroduckie]

This is the script for a locked level door. the key you need is level_4_key.
It is supposed to activate a grunt when the door is unlocked (as a scare).

void UseKey(string &in asItem, string &in asEntity)
{
AddUseItemCallback("", "level_4_key", "level4", "UsedKeyOnDoor", true);
}

void UsedKeyOnDoor(string &in asItem, string &in asEntity)
{
SetLevelDoorLocked("level4", true);
PlaySoundAtEntity("", "unlock_door", "level4", 0, false);
RemoveItem("level_4_key");
SetEntityActive("servant_grunt", true);
}

Where did I go wrong?