I know that this question was for Grammy but I have to answer for myself and say that yes, of course the door is locked. It's locked for safety. Why use a crate instead of a dog bed if you're not using it for safety and confinement?
I have 5 dogs Bobsk8. One is 85 lbs. and the other 3 are under 10 lbs. There is no way that I would leave a 1.3 lb. dog and a 15 year old (3 lb.) dog who stumbles and falls often, out and running around while I'm away. The other 2 brussels were crate trained due to Sep. Anx. issues that they had when they arrived and as a trainer I KNOW that their crate training has made them feel much more secure.
Many dog with Sep. Anx. issues are much safer and much happier in a crate due to the stressful pacing and distructive behavior that accompanies that particular problem.
I have 4 crates but usually allow my dogs to double up (their choice) unless I'm providing a kong treat in which case they are seperated. I have never left a dog in a crate for more than 3 hours at a time during the daytime hours. At night time, my dogs file into their crates as they get tired...their choice entirely. Actually, if the door to Amos's crate is closed when he wants to get in, he'll open it, jump in and close it behind him.
I don't know how else to say it other than that you are wrong about this being unkind or cruel. My dogs LOVE their crates. I'm finding the arguements against proper crating just silly. They ARE safe, they ARE NOT unkind, when used properly they're a great way to ensure safety AND COMFORT for your dog while your away for short periods.
Any method of confinement, crating, outdoor dog run, tie outs....all of them can be abused but no one is suggesting that crating for long periods is a good thing.