Why can't the newly matched key turn when inserted?

[DeMarcus]

Here are the specific reasons why the newly matched car key cannot turn: 1. Connection device failure: The door handle and door lock have a connection device failure. The door linkage mechanism may have detached due to driving bumps, preventing the door lock from sensing the action of pulling the door handle. 2. Frozen door in winter: If the door lock, door handle, or door frame area freezes in winter, the key cannot open the door. Do not force the door open if it is frozen, as this can easily damage the door. Only pour hot water on the frozen area to speed up ice melting. 3. Wrong key turning direction: Incorrect operation with the wrong key turning direction. In most cases, turning the key clockwise unlocks the door, while turning it counterclockwise locks it. 4. Lock cylinder failure: Most car owners use remote keys to open or lock the door, rarely using mechanical keys. Due to prolonged disuse, the lock cylinder may rust. Try adding some engine oil to the lock cylinder.