Contao 3 – redirect to a frontend url from page alias

<?php

class MyModule extends \Module {


    protected function compile() {

            $page_alias = 'my-page-alias';
            $arrPage = \PageModel::findPublishedByIdOrAlias($page_alias)->current()->row();
          
            $strUrl = $this->generateFrontendUrl($arrPage, '/additionalquerystring/vars');

            $this->redirect($strUrl);



    }

}