How do you open a Mazda protege door when the lock won't work?

If the lock on your Mazda Protege won't work, you can try using a slim jim or a coat hanger to unlock the door manually. Carefully insert the tool between the window and the weather stripping to reach the locking mechanism. Alternatively, you can use a wedge to create a small gap and insert a rod to manipulate the lock. If these methods fail, consider calling a locksmith or a professional for assistance.