what does this mean?

[megsb927]

You need to give us your script so that we can see why it's not working.

void OnStart()
{
AddUseItemCallback("", "Key_3", "castle_1", "UsedKeyOnDoor", true);
}

void UsedKeyOnDoor(string &in asItem, string &in asEntity)
{
void SetSwingDoorLocked("",);
PlaySoundAtEntity("", "unlock_door", "castle_1", 0, false);
RemoveItem("Key_3");
}

void OnEnter()
{

}

void OnLeave()
{

}
I'm not sure what to put after SetSwingDoorLocked I don't really understand what it's saying on the guide