Why would they be doing it unwillingly, giving someone hormones who doesn't want to or is unwilling to take them is grossly unethical and violates their bodily autonomy and their dignity. If they aren't willing it shouldn't be done at all.

For people who will say that they're "in-denial" I just want to say that self-determination is very important especially when it comes to something like gender transition and trying to take that away from them is disrespectful to them and even psychologically harmful.