If key does not turn in trunk lock and internal release suddenly does not work how do you repair?

If the key won't turn in the trunk lock and the internal release isn't working, start by checking for any obstructions in the lock mechanism or trunk latch. Lubricate the lock with a penetrating oil to free up any stuck components. If the lock is still unresponsive, you may need to remove the trunk panel to access the locking mechanism directly and diagnose any issues, such as a broken cable or latch. If the problem persists, consider consulting a professional locksmith for further assistance.