public function createAdmin($email, $username, $password, $roles, $lastName = '', $firstName = '')
{
$user = new User();
$user->setEmail($email);
$user->setEnabled(0);
$user->setUsername($username);
$user->setSubscribe(new \DateTime('now'));
$user->setRoles(serialize($roles));
$user->setLastName($lastName);
$user->setFirstName($firstName);
$salt = uniqid(mt_rand(), true);
$options = ['cost' => 11, 'salt' => $salt];
$user->setSalt($salt);
$user->setPassword(password_hash($password, PASSWORD_BCRYPT, $options));
$this->em->persist($user);
$this->em->flush();
}