Healy was restored to the starting line-up after being named as a substitute for the previous three matches but he made little impact alongside newcomer Tresor Kandol and was subbed for Ian Moore after missing a good chance.
Wise told the Yorkshire Press: "David's form isn't fantastic at the moment. He is trying but it just isn't happening for him and he needs to work harder.
"You have to keep going and work as hard as possible to make it change. We want to help him because he is not going through a good spell.
"Sometimes you need a miss-hit shot to go in and he needs that to set him off scoring again, but it won't happen if you don't work. You bring your own luck in football."