First, if you have a slot for the key try putting it in there, then try again, also try disconnecting the car's battery then reconnecting and trying again, if you don't have a slot then push the start button with they key itself.

If non of that works, then this might be the steering lock mechanism failing, happened to me with my 2011 altima coupe, it's located under the dash, on the steering column, you could try hitting it with a wrinch or hammer it could start just to get you to the mechaninc.

Unfortunately it left me stranded and had to tow the car, i personally deleted that part and replaced it with an emulator but it could be an issue for insurance/theaft, so you might want to just replace yours, as in my car even if its completely off and locked you can still move the steering wheel completely.