public function loadFOSUser()
 {
     foreach ($this->loadRaw('User') as $key => $data) {
         $entity = new User();
         $entity->setEnabled(true);
         $entity->setFirstName($data['firstName']);
         $entity->setLastName($data['lastName']);
         $entity->setUsername($data['username']);
         $entity->setEmail($data['email']);
         $entity->setPlainPassword($data['plainPassword']);
         foreach ($data['roles'] as $role) {
             $entity->addRole($role);
         }
         $entity->setDateOfBirth(new \DateTime($data['dateOfBirth']));
         $this->addReference($key, $entity);
         $this->manager->persist($entity);
     }
 }