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Do you have any WD 40 by chance?
Alright, you sprayed it directly into the lock cylinder correct? and tried it and it didn't help ? correct?
Alright, Have you tried putting a little bit of pressure on the key and move the steering wheel back and forth while holding pressure on the key, and seeing if that gets the ignition switch to turn.
Does it even turn to the accessory position? or it doesn't turn at all?
Alright, I would try blowing some compressed air in it, that can blow some of the small metal key shavings around some and free it back up sometimes, what happens is over time small particles of the key fall into the ignition lock cylinder as you drive and it rubs inside the lock cylinder, eventually enough of these build up to where the lock fails or the key doesn't work anymore, If you can take some compressed air and blow into the hole, that may help, or take a small hammer or screw driver handle, put the key in and physically knock it in like your trying to knock it in further than it should go, That can help as well, If none of that works, then I would recommend calling a mobile automotive locksmith in your area, He will have a lock pick set and be able to get the lock cylinder out and likely re-key a new lock cylinder to work with your existing keys. That would be the most economical solution vs. towing it to a shop or dealership. Let me know if you have any further questions. Thank you.
There is really nothing else I can give you other than those steps to try. If the lock cylinder has failed, there is really nothing else you can do but replace it unfortunately.