Schizophrenic man sits outside and police can’t do anything.

So there’s been a schizophrenic guy who sits outside my store, who is trespassed from the store and from the shopping area, and the police do nothing. They ask him to leave, he walks away until the police leave, and then he’s right back. It wouldn’t be an issue but he constantly yells and threatens people, including children, women, and elderly. He has started even yelling at people asking for crack. This happens in Carrboro of North Carolina. Anyone know if there’s anything the police can actually do to get this man to stay away from the store?