You're not a lawyer and you don't even play one on TV, but sometimes you pretend to be one to get things done. Is impersonating a lawyer a crime?
Yes, most likely, although context is everything. You won't end up in jail if you strongly insinuate that you are an attorney to influence a store clerk to serve you (and it's unlikely to help anyway considering how little people care for lawyers). But if you actually practice law without a license and misrepresent yourself to clients, you face criminal and civil liability.