docs: def refresh(self, force=False):
          """Refreshes the `access_token` and sets the praw instance `reddit_client`
          with a valid one.
  
          :param force: Boolean. Refresh will be done only when last refresh was
              done before `EXPIRY_DURATION`, which is 3500 seconds. However
              passing `force` will overrides this and refresh operation will be
              done everytime.
          """
          if self._is_token_expired() or force:
              tokens = self._get_refresh_access()
              self.access_token = tokens['access_token']
              self.refresh_token = tokens['refresh_token']
              self._set_access_credentials()