The other question that I would have to have is whether the exact phrasing makes a huge difference. Is it illegal to 'order' someone to do something? I can ask my sister to give me a turn using the telephone. Even if I do not have the legal right to do so, it is not illegal - she can simply refuse to comply. Additionally, if I am the owner of a store or other business, I believe, though IANAL, that I do indeed have the right to tell someone to leave my property, just as I can ask them to leave my home.