(1) Stick his pen in the latch
(2) Pull the pins out of the hinge, or
(3) Kick the thing, repeat as necessary

Any Pilot who can't extricate himself from a plastic honeycomb door does not have the common sense to be in command of a jetliner.

Heck, how many of us have had those things simply fall out when bumped?

One one aircraft type Cockpit Door used to fall out when the power was pushed up for takeoff. the French had a complex electromagnet cockpit door locking system with a computer and lights. The problem was the hinges were the same crap that must be used to hold the glove box door on a Citroen 2CV. When a cockpit door hits the floor flat, it is really, REALLY, loud.

The FAA Certified the design. That doesn't say much. The FAA Certified the MD88.