Elevators

When I was a kid, I remember watching a tenant in the building I lived in open an elevator door by sticking a butterknife into that little round hole that we see on the door. I also remember, back in the day, that elevators had trap doors on the roof of the cab. Nowadays, the newer elevators have no such trapdoor nor little round hole on the interior of the cab. The idea being that in an emergency, the last thing rescuers want is elevator passengers crawling around the roof of the elevator.

I’ve never found much info about how those little round holes on the elevator door worked, though. And am curious about how a person would force open elevator doors these days.I know some of you reading this work in fields that might have some knowledge on the subject…anyone have any links to any references on how to escape or force your way into an elevator?