How to make a make a door that need two keys to unlock it?

[Raymond]

void OnStart()
{
AddUseItemCallback("UseKey1", "prisonkeylight_1", "mansion_3", "KeyCounter", true);
AddUseItemCallback("UseKey2", "prisonkeydark_1", "mansion_3", "KeyCounter", true);
SetLocalVarInt("KeysUsed", 0);
}

void KeyCounter(string &in asItem, string &in asEntity)
{
SetLocalVarInt("KeysUsed", GetLocalVarInt("KeysUsed")+1);

if(GetLocalVarInt("KeysUsed")==2)
{
SetSwingDoorLocked("LockedDoor", false, true);
}
}

Like this?