Y'all are PRESUMING that Chrysler's "locked" the same way that GM cars did back then, which they didn't!
Since the earlier '60s, with a GM car, you'd punch the lock button down, push the outside handle button, and close the door. It would be locked. Try that with a Chrysler of similar vintage, and it might break something.
Push the inside lock button and close the door? It'll push the lock button up as the door closes.
The REASON was not to make life rougher, BUT to make you have the car keys in your hand to lock the door, rather than them be in the ignition switch when the door was locked. Plain and simple! Therefore not needing to orchestrate "Other methods" of getting into the car to retrieve the keys that were in it.
Seems like all of this alleged "foolishness in engineering" had given way to the GM-way of things by 1970? I know that our '72 Newport was "punch the button, close the door". No need to hold the outer button in any more, which was easier than the old "GM Way".
Enjoy what made Chryslers CHRYSLERS,
CBODY67