Mike,
There are two similar keys. One is for the cargo bay doors and the other for the entry door. They both look the same and only have slightly different tumblers. I have found my cargo bay will open other coaches entry doors and my entry door will open other coaches entry doors or cargo doors. If you have two similar keys, one will be for the entry door. Jerry was correct.
If you don't have both keys, go to a locksmith and show him the key you have and he normally can make a key for the entry door. I place the entry door key either on my car key ring or in the car as when the entry door keypad doesn't work, the key will work.
Roy Warren