Car door is locked and won't unlock?

If your car door is locked and won't unlock, first try using the spare key or remote to see if it works. If that fails, check the battery in your key fob, as a dead battery can prevent it from unlocking. If you're still unable to unlock the door, consider using a slim jim or calling a locksmith for assistance, especially if you're locked out. Always avoid using excessive force, as it may damage the door or locking mechanism.