Product Order by

<?php
//  Order Posts using pre_get_posts in code snippet
add_action('pre_get_posts', 'arsh_order_by');

function arsh_order_by( $query ) {
    if ( ! is_admin() && $query->is_main_query() && is_post_type_archive( 'product' ) || is_tax( 'product_category' ) ) {
        $query->set( 'order', 'ASC');
        $query->set( 'orderby', 'menu_order');
    }
}
?>