The best way to deal with this is to lock them in the hutch for a few days and do not let them out. This will give them the idea that it is safe to be in and comfortable for them. Otherwise, they may never use the hutch.
I keep my Bobs in an aviary along side a greenhouse in which thru a hole cut into the greenhouse, there is a rabbit hutch as their shelter. I have them "clicker trained" to get into this "coop" for emergencies, cold nights or when ever I need them to get out of the aviary. (I have way too many birds to mess with catching each one of them LOL) So I started by showing them the dreaded "quail net" all the while clicking my dog clicker and at the same time, telling them to "get into the coop". To avoid the scary net, they automatically ran to the furthest point, which was inside the coop. After a few times holding that net, I no longer needed it and all I had to say was "get into the coop" while clicking the clicker. There are some nights when it is due to get down well into the minus 10 range, and sometimes they go into the coop by themselves, and sometimes I have to order them inside. For training purposes, I used to leave them a big tray of goodies inside the coop so that clicking them in was a reward. They no longer need the goodies. And now after all these years, just telling them to "get into the coop" works just as well. The well versed older birds automatically train the younger birds as well.
So give it a try on training them. They are pretty smart birds and learn pretty quickly.
