Symfony select form with conditon

// src/Form/UserType.php
namespace App\Form;

use App\Entity\User;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use Doctrine\ORM\EntityRepository;

class UserType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('users', EntityType::class, [
                'class' => User::class,
                'query_builder' => function (EntityRepository $er) use ($options) {
                    return $er->createQueryBuilder('u')
                        ->where('u.age > :age')
                        ->setParameter('age', $options['min_age']);
                },
                'choice_label' => 'name',
            ]);
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setRequired(['min_age']);
        $resolver->setAllowedTypes('min_age', ['int']);
    }
}

// src/Controller/UserController.php
public function index(Request $request)
{
    $form = $this->createForm(UserType::class, null, ['min_age' => 18]);
    $form->handleRequest($request);

    if ($form->isSubmitted() && $form->isValid()) {
        // 处理表单提交
    }

    return $this->render('user/index.html.twig', [
        'form' => $form->createView(),
    ]);
}