code: def locked_get(self):
          
          query = {self.key_name: self.key_value}
          entities = self.model_class.objects.filter(**query)
          if len(entities) > 0:
              credential = getattr(entities[0], self.property_name)
              if getattr(credential, 'set_store', None) is not None:
                  credential.set_store(self)
              return credential
          else:
              return None
docs: Retrieve stored credential from the Django ORM.
  
          Returns:
              oauth2client.Credentials retrieved from the Django ORM, associated
               with the ``model``, ``key_value``->``key_name`` pair used to query
               for the model, and ``property_name`` identifying the
               ``CredentialsProperty`` field, all of which are defined in the
               constructor for this Storage object.