My key just one day stopped turning in my ignition. Any idea why?

All of the obvious things have been checked like my wheel being locked and I'm securely in park, I've tried lubricant on my wheel. When I stick my key in the ignition (of my 2002 focus), it beeps when I have the door opened. So it recognizes a key is in there, but won't turn. Do you think this is a key issue or an ignition issue? To get my key replaced I have to get my car towed to the ford dealer and it's gunna cost me 80-90 to get one made. Will they be able to tell me Wether or not it's my ignition vs key at the dealership?

I meant to say lube on my key.

Get the car to the dealership and let them figure out what the problem is. That is what they are paid to do. I assume you know to have your foot on the brake when you are trying to start the car; it could be something in that safety feature, possibly something simple like a relay switch that went bad.

Your key is worn and not working as it should. Just take your title to the dealer. They can cut a new key with their code cutting machine that references the VIN number to a code and that way it won't just duplicate the old worn out key. If you're lucky it will fix your problem. Ask if it's a key with a security chip in it. If it is you may be able to tape the old key next to the ignition switch so the chip receiver thinks you have a key and lets the new key start the car. You'll need to drive the car to the dealer to get the new key programmed to the car if it is a chipped key.