security door lock
Our front door has an old wrought iron security gate in front of it. The gates lock is about the size of a half dollar. Its one that you have to use a key in, no matter if you are on the inside or outside. If we lock it from the inside (standing in the house) it is secure and wont pop open. If we lock it from the outside when we leave the house you cant just turn the key you have to turn it the wrong way all the way and then the right way and if you press on the gate the lock pops open.
Any ideas why it locks from one side but pops open from the other?