Crate Training A Puppy That Cries And Doesn’t Freely Go Into His Crate?

we have a 3.5 month old cockapoo which we got cratetrained from a breeder. however, when we put him in there in the daytime (and we go to work) he cries for about an hour (that we know of). we have a walker come in twice a day, but he really just gets so upset, that it’s upsetting to us. He doesn’t love treats, so it’s hard to lure him in there w/food, and he doesn’t freely go into his crate, so what should we do? I hate to think of him crying all the time when we’re not there.
thnx