def METHOD_NAME(self):
    """Return the a boolean representing whether the lock is locked."""
    lock = None
    if self._lock_dp:
        lock = self._lock_dp.get_value(self._device)
    else:
        for d in (
            self._unlock_card_dp,
            self._unlock_dynpw_dp,
            self._unlock_fp_dp,
            self._unlock_offlinepw_dp,
            self._unlock_pw_dp,
            self._unlock_tmppw_dp,
            self._unlock_app_dp,
            self._unlock_key_dp,
            self._unlock_ble_dp,
            self._unlock_voice_dp,
        ):
            if d:
                if d.get_value(self._device):
                    lock = False
                elif lock is None:
                    lock = True
    return lock