My key won't lock the car doors.
I’m not sure if you mean the actual key, or the key fob(keyless entry). If the actual key will not lock the driver’s door, did you try the trunk, or the passenger door? If it only works in the ignition, it’s possible the ignition cylinder was replaced, and uses a different key. If you are talking about the key fob. If the unlock, and trunk button work, but not the lock button, the fob is defective. If needed, a certified mechanic can inspect your doors and replace your key fob if needed.
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