Does the check engine light come on when you turn the key to the on position?
Does the engine crank over and not start or does it not even crank over?
The engine light does not come on. The lock is frozen and the ignition key will not turn over.
The engine does not crank over. The lock for ignition key is frozen and will not turn.
I would honestly try another ignition key if you have one available. If not or if using another key will not work, the ignition lock cylinder is bad and will need to be replaced.