What to Do When the Car Door Won't Open with a Mechanical Key?

[McJulia]

Solutions for when the car door won't open with a mechanical key: 1. Inject some engine oil into the lock cylinder to lubricate it and then try to open it; 2. Check if the car is in anti-theft lock mode, as the mechanical key cannot open the door in this state—it needs to be deactivated first; 3. Replace the lock cylinder; 4. Use the remote key to open the door; 5. Contact a professional for inspection and repair. It's important to note that in most cars, the central locking mechanism uses a mechanical latch to secure the door. If the door lock isn't engaged, the door can be opened using the exterior door handle or the interior door handle.