当我将记录更新到symfony中的表时，如何获得主键？

As we knows, If update a record, we will get boolean value back, but if I want get primary key id back. How should I write the querybuilder?

$dq = $this->repository->createQueryBuilder('u');
$query = $dq->update()
    ->set('u.isLocked', $dq->expr()->literal(true))
    ->where('u.token = :token and u.isDeleted = :isDeleted')
    ->setParameter('isDeleted', false)
    ->setParameter('token', $token)
    ->getQuery();

return $this->execute($query);