How realistic is it for someone to enter a pot of honey? If you have the right character everything can happen. Just make it believable that your character is curious enough and does not usually think ahead. If your character previously acted cautious in all other encounters than the reader would throw the book aside and say "why the f would he go in there?!", but if the character can not resist anything unusual than it's fine.
How realistic is it someone got stuck on a wall of honey? On the middle of the wall? Not so much. Why would someone get stuck to a wall to begin with. If the characters enters the pot from the top, would they not jump down? No, on that part I would scratch my head and imagine the person, even if stuck on the wall to begin with, slowly gliding downwards.
Honey is runny, even the creamier kinds, and thereby it would gather on the floor. Also, there could be wax cakes on the floor, seemingly tough to begin with, then suddenly giving in. The character could get stuck to the knees, belly or even only with the head potruding. The arms could be free and try to dig their way out, but the honey is too runny and sluggish at the same time. Or the arms are stuck as well, only the hands free but useless, wiggling around. You could make it a slow sink or a sudden brake.