a sticky tumbler may cause this. one or more tumblers actuated and pushed further than usual when using a different key can cause it to stick, thereby jamming the key.
as stated above, all the Chrysler keys of this era would normally slide in and out. If it’s a different model key, and it’s jammed because the grooves don’t line up, it may take more force to remove it.
You may need to use pliers. Limit your plier-applied force to pulling the key straight out, never back and forth. you don’t want to risk breaking the key off.
Begin presuming it’s a sticky tumbler. use your hands and jiggle it a lot. the more the better. especially in the direction of the tumblers. heating the key with a lighter can help too. jiggle the blank out of it, then periodically, apply the pulling force.
if that fails, move on to the pliers pulling the key straight out. you may have to pull pretty hard.
the absolute worst-case scenario is breaking the key off with part of it still inserted. Then lesser bad result is the key removes, but one of the tumblers is damaged preventing the correct key from working. in either case, a locksmith and considerable labor may be needed to repair.
if you get the key out, and the issue is a sticky tumbler, squirting some graphite powder in there, and working the correct key in and out several times, may set things right, again.