I bought a car with no keys. I can change out the locks but I can not get into the trunk to be able to change the lock. I took the back seat out and attached a flat screwdriver to the end of a short pole. Then I reached in and tried to turn the rear of the lock slot. I can turn it about 90 degrees in one direction but the trunk will not pop. What am I doing wrong? Do I have to drill the lock out?