It's somebody's BS!! Take a Good look at the lock cylinder in the door before they start with the Tennis ball!! It has already been twisted loose in the outer door panel from a screwdriver or something similar!!(Note dents and buckles around Lock cylinder!!) When she pushes on the ball she is also turning it slightly,moving the cylinder and lock rod unlocking the door!!You could do the same thing pocket knife or screwdriver in the cylinder slot,it's loose in the door!!
I agree, I don't see it happening. Even if you could force enough air into the panel to cause that much pressure, the locking system is mechanical not pneumatic