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Hi, if you cannot remove the key I would have to think that there is a problem with the shifter. If the shifter is not going all the way into park it will not allow the key to be removed from the ignition. There is a cable that runs from the shifter to the ignition switch that releases the key once the shifter is in park. You might try pushing forward on the shifter and see if the key will turn the last little bit of the way on release. Push forward on the shifter and turn the key counterclockwise then pull. Make sure that you are not pressing the brake pedal.
Sounds good. Let me know how you make out.