Need help on the inventory texts and door texts!

[TerrorsEnd]

void OnEnter()
{
AddUseItemCallback("", "cellarkey", "level_cellar_1", "KeyOnDoor", true);
}

void KeyOnDoor(string &in asItem, string &in asEntity)
{
SetLevelDoorLocked("level_cellar_1", true);
PlaySoundAtEntity("", "unlock_door", "level_cellar_1", 1, false);
RemoveItem("cellarkey");
}

I have it like this and it doesn't work.
Also I got the notes working.