protected function getUsers()
    {
        $qb = $this->registry->getManager()->createQueryBuilder();

        $qb
            ->select('u')
            ->from($this->userClass, 'u')
            ->where($qb->expr()->like('u.roles', ':roles'))
            ->setParameter('roles', '%"ROLE_SUPER_ADMIN"%');

        return $qb->getQuery()->iterate();
    }