Set the visibility timeout for the queue.

        :type visibility_timeout: int
        :param visibility_timeout: The desired timeout in seconds

def set_timeout(self, visibility_timeout, callback=None):
        """
        Set the visibility timeout for the queue.

        :type visibility_timeout: int
        :param visibility_timeout: The desired timeout in seconds
        """
        def _set_timeout(retval):
            if retval:
              self.visibility_timeout = visibility_timeout
            if callable(callback):
                callback(retval)
        retval = self.set_attribute('VisibilityTimeout', visibility_timeout, callback=_set_timeout)