to remove the key the vehicle not only needs to be in park but the switch which tells the ignition lock cylinder the vehicle is in park also needs to be engaged .I would start my sarch at the steering coloum and look at the swithc mechanism from the selector (either electrical or mechanical cable ) if this is not located properly then the key will not switch back enough to take out
Only the dealer can do this, with a scan tool.
get a new lock
The lock went bad. Call a locksmith and get a replacement installed.
WD40 can work wonders, gets to places other lubricants can't even imagine :-)
your battery is dead
the switch is probably stuck. try spraying silicone in key slot insert key and gently tap key with rubber hammer than try turning it.
To disarm the security system on a 1997 Oldsmobile Aurora, simply press the red button on the key fob. If the key fob is not available, insert the key into the ignition and turn.
how to remove key stuck in ignition switch in Chevy colbalt
pull it out
how do i get a replacement key for a 2001 chevy cavalier
Wiggle the key as you turn the key while in the ignition switch. My 1994 gets stuck about once a month.
If a key is stuck, try turning it and making sure the key is in the off position. Next try some lubricating spray meant for cars, it should help get it out.