Enforcing record id in data fixtures when AUTO strategy is set in entity

use Doctrine\ORM\Mapping as ORM;
use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;

/**
 * @ORM\Entity
 * @ORM\Table(name="user")
 * @UniqueEntity(fields="username", message="Username is already in use.")
 */
class User
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\Column(name="username", type="string", length=20, unique=true)
     */
    protected $username;

    /**
     * @ORM\Column(name="password", type="string", length=40)
     */
    protected $password;
}

use Doctrine\Common\DataFixtures\AbstractFixture;
use Doctrine\Common\DataFixtures\OrderedFixtureInterface;
use Doctrine\Common\Persistence\ObjectManager;
use Application\BackendBundle\Entity\User;

class UserFixtures extends AbstractFixture implements OrderedFixtureInterface
{
    public function load(ObjectManager $manager)
    {
        foreach ($this->getData() as $data) {
            $user = $this->getUser($data);

            $manager->persist($user);

            // Enforce specified record ID
            $metadata = $manager->getClassMetaData(get_class($user));
            $metadata->setIdGeneratorType(\Doctrine\ORM\Mapping\ClassMetadata::GENERATOR_TYPE_NONE);
        }

        $manager->flush();
    }

    private function getUser(array $data)
    {
        return
            (new User())
                ->setId($data['id'])
                ->setUsername($data['username'])
                ->setPassword($data['password']);
    }

    private function getData()
    {
        return
            [
                [
                    'id' => '11',
                    'username' => 'inanzzz',
                    'password' => '09cd68a2a77b22a312dded612dd0d9988685189f',
                ],
                [
                    'id' => '22',
                    'username' => 'robertdeniro',
                    'password' => '09cd68a2a77b22a312dded612dd0d9988685189f',
                ],
                [
                    'id' => '33',
                    'username' => 'alpacino',
                    'password' => '09cd68a2a77b22a312dded612dd0d9988685189f',
                ],
            ];
    }

    public function getOrder()
    {
        return 1;
    }
}