Hard to diagnose from your description.
See my notes at the link.
Do It Yourself Diagnosis and Repair
Check the fuel pressure.
SOURCE: 2005 Chevy Impala ignition switch stuck in off position
if it doesnt turn you have a worn out ignition cylinder, the only fix is to replace it, Code the ignition lock cylinder, if necessary
CAUTION:Perform the body control module (BCM) theft deterrent relearn procedure whenever you replace the ignition switch lock cylinder.
SOURCE: 2006 Chevy HHR
start with the shifter. a common problem is the shifter is not making connection with the switch to tell the car its in park. jar ( hit) the shifter some and see if this doesnt let the key release. if this doesnt work then on plastic covering under the ignition switch is a small opening with a plastic cover. Remove the cover, feel with your finger until you find the release button for the key. The key will then come out.
SOURCE: Key stuck in ignition
Under the steering column is an access plug. Remove the plug and insert a small shaft driver into the hole and push up gently, the key will release.
SOURCE: key stuck in the ignition and wont let me out of gear
The shank of any GM key hits a lever that locks the key in place when turned into any position other than the off position. If it stuch in off, the cylinder must be replaced
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