he should learn that any human hand coming near him is a great thing, maybe the best thing next to recall. in class, the trainers had us slowly do this, reach down with one hand, a few inches away, treat with the other. get closer each time, finally do gentle collar grabs and tugs, release, and treat and praise away. this also helps later with pulling, dog learns that collar pull and release = look at human for treat
for no reason should he be convinced hands are a bad thing. Loneforce is right about the crate, don't force, allow him to go in on his own.