Metal lock
Technically this is a type of metal lock, just not the strongest because of course, it’s made with paper clips. Paper clips wouldn’t even stop a cat if there was one trying to open this cupboard to get whatever was inside. Don’t kid yourself, cats can open up handles, we’ve seen it before.
Why did they even bother to draw the lock and key next to the paper clip lock? Are they trying to suggest that you don’t need one at all to break into this cupboard? We think this is just some type of silly joke, no way anyone could be serious with a lock like this.