In my world, all locks are access control devices. This is pretty obvious and basic. The real question, and one which apparently escapes Kaba, is just how difficult that access is to accomplish.

With privacy locks, you just need to get the paper clip in deep enough to touch the pressure plate inside, and the door can be opened by twisting the knob.

Hopefully, now you have a basic understanding of locks and how to pick them. This is great and all, but actually practicing is a whole other story.