Find person using LIKE command in multiple fields with Doctrine2 and ZF2

PersonController.php

<?php

namespace Application\Controller;
use Zend\Mvc\Controller\AbstractActionController;

class PersonController extends AbstractActionController{
    public function searchAction(){
        $term = $this->params()->fromQuery('term', '');
        $qb = $this
            ->getServiceLocator()
            ->get('Doctrine\ORM\EntityManager')
            ->getRepository('Application\Entity\Person')
            ->createQueryBuilder('q');
        $qb
            ->orWhere($qb->expr()->like('q.name', $qb->expr()->literal("%{$term}%")))
            ->orWhere($qb->expr()->like('q.alias', $qb->expr()->literal("%{$term}%")))
            ->orderBy('q.name', 'ASC')
            ->setMaxResults(20);
        $persons = $qb->getQuery()->getResult();
        return array(
            'persons' => $persons
            );
    }
}