private function searchUsers()
    {
        $criteria = Criteria::create()
            ->where(Criteria::expr()->lte(
                $this->classMetadata->getPropertyName(ClassMetadata::LAST_ACTION_PROPERTY),
                new \DateTime($this->dateTimeRule))
            )
            ->andWhere(
                Criteria::expr()->neq(
                    $this->classMetadata->getPropertyName(ClassMetadata::API_KEY_PROPERTY),
                    null
                )
            );

        return $this->getUsersByCriteria($criteria);
    }