I kept turkeys years ago (I sound like somebody's old Granny now!) and kept them in a large pen with a house to go in and everything nice, but they still insisted on roosting in the trees.
I then had a taller run with roosts put in it and netting over the top, thinking well, stay out then! >: Lo and behold they decided to use their house every night. But I think they are happier roosting high up.