Form symfony multiple choice - forms

Question

I have a classic form in Symfony and there is one input with 4 different values, I would like to render those 4 values in my twig instead of a drop-down box.
I tried to do it with a loop but I can't do it for an array.
Here is my code :
$isAdmin = !empty($this->getSap()->fetchSapQuery('RECAP_AUTHORITY_ADM', []));
$flux = $this->getSap()->fetchSapQuery('RECAP_FLUX_LIST', []);
$form = $this->createFormBuilder()
->add('Secteur', ChoiceType::class, array(
'choices' => $this->getSap()->fetchSapQuery('RECAP_SECTEUR_LIST', []),
'label' => $this->trans('Secteur'),
'choice_label' => 'LibLong',
'choice_value' => 'SecteurId',
'required' => true,
'placeholder' => '',
'attr' => [
//'data-app-auto-select-unique-option' => 1,
'multiple' => 'multiple', // secteur monoselection
],
))
Here is my Twig :
{% block body %}
<div class="row">
<div class="col-sm-12">
<div class="card-box ">
<h2 class="m-t-0 header-title">{{ pageTitle }}</h2>
<form id="searchForm" class="form-horizontal search-form " role="form" action="{{
path('api_post', {id: odata_search}) }}" method="post">
{#{{ dump(form.Secteur) }}#}
{{ form_row(form.Secteur) }}
{{ form_row(form.Flux) }}
{{ form_row(form.Canal) }}
{{ form_row(form.Periode) }}
{{ form_row(form.CodeExterne) }}
{{ form_row(form.EQART) }}
{{ form_row(form.Division) }}
{{ form_row(form.Username) }}
<div class="form-group">
<div class="col-md-offset-3 col-md-4">
<button id="search" type="submit" class="btn btn-success" data-notification-
clear="true">{{ "Rechercher"|trans }}</button>
{% if isAdmin %}
<button id="btnNew" type="button" class="btn btn-success" disabled><i
class="fa fa-plus-circle"></i> {{ "Creer un rapport vierge"|trans }}
</button>
{% endif %}
</div>