Remove Container Element From wp_nav_menu() Markup

I have tried several options like setting 'container' => false and registering the theme_location and searching on forums but I am unable to get rid of the “div” coming with the wp_nav_menu
in my page:

<?php get_nav_menu();?>

function get_nav_menu() {
    $navMenuDefaults = array(
    'theme_location'  => 'header-nav',
    'menu'            => '',
    'container'       => false,
    'container_class' => '',
    'container_id'    => '',
    'menu_class'      => '',
    'menu_id'         => '',
    'echo'            => true,
    'fallback_cb'     => 'wp_page_menu',
    'before'          => '',
    'after'           => '',
    'link_before'     => '',
    'link_after'      => '',
    'items_wrap'      => '<ul id="%1$s" class="%2$s">%3$s</ul>',
    'depth'           => 0,
    'walker'          => ''
);
    return wp_nav_menu($navMenuDefaults);
}

and in functions.php:

function register_top_nav() {
  register_nav_menu('header-nav',__( 'Header Nav' ));
}
add_action( 'init', 'register_top_nav' );

I am not sure why I am getting the following output:

<div class="">
    <ul>
        <li class="page_item page-item-2">
            <a href="https://wordpress.stackexchange.com/questions/202502/url">Sample Page</a>
        </li>
    </ul>
</div>

How can I get something like following:

<ul class="abc">
    <li>
        <a href="#">dfdf</a>
    </li>
</ul>

thanks.

FYI :container => '' is a string operation and it’s default set by div you can’t use true or false like bool expression.

Just change the container => 'ul' then i hope you will get what you want to see.
for more details please read this : https://developer.wordpress.org/reference/functions/wp_nav_menu/

Thanks
Musa