With the door lock that everyone seems keen on cutting off the internal lock trigger that stops the door being unlocked from the outside even with the key. All they have to do is, provided you have two locker doors on the left hand side, I have, and I also had a porta pottie door fitted.  Then I took a heavy duty plastic coated hanger, straightened it out, bent a hook on one end. I measured and tried it several times, so if I was locked out by the trigger, then I unlock the forward locker door, remove things that are in the way, the porta pottie too, if necessary, put one arm and head and shoulder in the locker, open the porta pottie door, or lift up the left hand seat sufficient to see the trigger, hook it with the ''coat hanger'' and click it towards me, then unlock the door with the key, and go in. The ''coat hanger'' stays on the floor in the front locker.  Neil Louer