docs: def client_unblock(self, client_id, error=False):
          """
          Unblocks a connection by its client id.
          If ``error`` is True, unblocks the client with a special error message.
          If ``error`` is False (default), the client is unblocked using the
          regular timeout mechanism.
          """
          args = ['CLIENT UNBLOCK', int(client_id)]
          if error:
              args.append(Token.get_token('ERROR'))
          return self.execute_command(*args)