Buick Car Key Question?

I have a 1994 used Buick Lesabre. I dont have a door key for it, just an ignition key, and the handheld lock/unlock mechanism. I went to a dealership and had them make me a door key, but it would not work. So the guy went back inside the dealership, and checked the code for the key, and also checked the VIN number on the car to make sure it matched my registration. He then Made another key, and it still would not unlock the doors. The cylinders on the car have never been changed. Its just a plain key, and it does not have a chip in it. Can anyone diagnose this problem and tell me why the keys wont work, but the handheld eletrical mechanism will? Thank You