* The key is not inserted correctly. Make sure that the key is fully inserted into the lock cylinder and that it is turned in the correct direction.
* The lock cylinder is damaged. If the lock cylinder is damaged, it may not be able to turn the key. You may need to have the lock cylinder replaced.
* The key is worn out. If the key is worn out, it may not be able to engage the tumblers in the lock cylinder. You may need to have the key replaced.
* The key is not the correct key for the car. Make sure that you are using the correct key for your car. If you are not sure which key is the correct one, you can try all of your keys until you find one that works.
If you have tried all of these things and the key still will not move, you may need to take your car to a mechanic to have it diagnosed.
