Do you know what part of the handle/lock part is broken? Is it the "ears" that go into the side frame that are broken/not working? If so those ears are replaceable from several sources. I know a guy who makes them out of aluminum and he guarantees them for life. I've replaces all of the original Fleetwood plastic ears on my coach.
The compartment door handle its self is a pretty simple device. Could you post a few more details as to what is broken?
I've been motorhoming for 22 years now, and I don't think I have ever locked those compartments. This reminds me to check and see if the lock part still works!