def set_locked_variable(self, key, access_key, value):
        """Set an already locked global variable

        :param key: the key of the global variable to be set
        :param access_key: the access key to the already locked global variable
        :param value: the new value of the global variable
        """
        return self.set_variable(key, value, per_reference=False, access_key=access_key)