Why would a key not come out of the ignition of a 1991 Acura Integra?

This is the little box located behind the radio if you enter your hand where your radio would be you could see what iam talking about, also if you press the button on the shifter and don't let it go and play with it while in park the light would come on i hope this works for you.

ANSWER

start your car(or at least put kjey in second position) put it into gear(or if still off just move into neutral) and put back into brake, pull e brake and turn car off and remove key.