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Thanks for posting
the lock cylinder is most likely worn and needs to be replaced, it comes with new keys, the cylinder can be replaced by putting the key in the ACC position, the pushing the release pin in on the housing, you will have to remove the plastic covers around the steering column to get to the release pin, if you are going to do this yourself please let me know if you need more detailed instructions.
The release pin is in a small hole in the housing where cylinder goes, it should be on the bottom of the housing, if you get the new cylinder you can see where the pin is, as I already said the plastic covers just below the steering wheel have to be removed, once the cylinder is out it's just a matter of pushing the new cylinder in with the key in the acc position, the keys that come with will only work in the ignition not the other locks on the car, if you want to have a key to work with the ignition and all the other locks you will need to have the lock 're keyed' so it will do that, this involves taking the cylinder apart to change the tumblers inside, if you don't mind having a separate key for the door locks you can save some money and just put in the new cylinder.
Hello, the screw holds the illumination fixture for the key it does not need to be removed, to get the cylinder out put the key into the ACC position, depress the pin in the hole and pull it out, refer to the attached illustration (link) for the pin location