Button to download file and redirect to new page

How do I enable my button to download and redirect to a new page? I have tried many code combination but it just downloads and does not redirect

<div class="banner">
    <h3>Download your file:<br> {{ filename }}</h3>
    <div>
        {% csrf_token %}
        <form action="{% url 'download_pdf' %}" enctype="multipart/form-data" method="post">
            {% csrf_token %}
            <button onclick="openTab()" class="btn btn-primary w-20" id="myBtn" tabindex="4">Download PDF
            </button>
        </form>
    </div>
</div>
<script>
function openTab() {
window.open('home');
}
</script>