It worked, sort off.
I stopped for gas, closed the drivers door when I went to pay & all the door locked with the key on the passenger seat. It cost me $65 for a mechanic to come & open the door. The agent at Enterprise was not very sympathetic when I explained that I was not informed that this would happen, he said I should of take the roadside insurance & offered a free upgrade the next time I rented a car. I needed a car the next day, he told me that I would have to go on a waiting list as he had no cars at the moment. Sorry Enterprise, I felt the service was not what I was expecting, I went to Avis & they were so helpful, I received an automatic upgrade with GPS thrown in. One has to learn by doing & I know who I will go with next time.