Q: Ignition cylinder locked up.

Try all available keys you have and turn the steering wheel towards the center to ensure the steering wheel lock is not binding and preventing the key from being turned. If keys are excessively worn you may want to get a fresh key cut by code from the dealer to try. Generally in this case, however, either the lock cylinder itself or the ignition lock cylinder housing on the steering column is worn/damaged if neither of the above measures allow the key to be turned. Enlist the help of a mechanic like one from Your Mechanic, to remove the ignition lock cylinder from the housing and inspect the components to determine the faulty component and assist in the final repair.