Key stuck ignition

Sounds like you have an issue with the shifter interlock. Either a bad actuator solenoid, cable, or brake switch I would think.

The stuck in park is easy disconnect the linkage at the transmission and move the selector red by two notches (by hand) this will place the transmission in neutral if there is resistance chock the wheels release the handbrake and rock the car ( back and forward to take load off the parking parking pawl which is stuck) no electrics is because of the ignition position remove the ignition switch from the column this isolates from the ignition lock and manually move the slide until the engine starts (make sure the hoot & hand brake are applied in case you ******* up the selector job and left it in gear. once the engine starts reconnect the transmission linkage. restart the engine and run the selector through the gears if all is OK.either cut the old ignition lock off the steering column and replace or get a locksmith to remove the key and then re-cut a new key from the spare or from the manufacturers code. all done

If you would say what make ,model an year vehicle we could give you better advice . Not being able to put into gear makes me believe you have a problem with the shifter interlock system ! Can you start the vehicle ? Will the key turn to start position ?

Possibly crawl under car and dissconnect the shifter and manually move the selector on the trans out of Park Position. Normally the locking feature is in the steering column.. which you can also take apart to release this feature.

By now, you have probably figured out it is the battery.
They can quit without notice any time.

Tumblers are worn in ignition or key is worn down.

Pull or push the auto transmission gear selector slightly further in each direction from the "park" position. The key can not be removed unless the car is in park. If the gear selector is not in the exact spot needed - the ignition will not move to allow the key to be removed. Likewise, if the car battery is dead, you may not be able to remove the key until you connect to another car with jumper cables to energize the ignition circuits.

Good luck!

Gear shift is not totally in the park position - had the same problem with a 2011 Acura TL - a rubber band kept the gear shift lever from totally seating in the park position.

first thing to try would be to remove car from park to a gear and then put firmly back into park...... then retry,
if doin that a few times dont work, you will prob need to replace the ignition cylinder....... make sure it appears gear selector levers parts are all in their place,, visually that is