Transmission doesn't go to park

My 1993 Sundance with automatic transmission abruptly jammed. It won’t go into park but will go into the other gears including reverse. Since the only way to stop and “park” the vehicle is to shift into neutral, the key is now permanently stuck in the ignition. What did I do or what happened?!!

Replace the shift cable. The shift cables fray and bind up with age/usage. Remove the console bezel, you should be able to disconnect the shift cable from the shift lever, move the lever to the park position and remove the key until you get a replacement cable. Set the parking brake first.