If you have not done so yet, with it in park, rock the vehicle back and forth by the bumper a couple of times to make sure that it is fully in park and then try to turn the key.
If it doesnt turn, then with a hammer, GENTLY tap around the ignition cylinder as you turn the key. If the tumblers are sticking and not aligning, this works like a charm.
If it works, then get some graphite spray from a hardware store and spray in the ignition cylinder, insert key and work back and forth several times. This will prevent it from happening again
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