Ok, you dont say if the key turns back to the off position or not.
First, make sure it is all the way in park
If it doesnt turn, use a hammer and GENTLY tap around the lock cylinder as you turn the key
If it is in the off position, use a hammer and GENTLY tap around the lock cylinder as you pull the key out.
The problem is likely sticking tumblers and this works like a charm to resolve this.
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