Sort by rating

Hi, excellent plugin!
I’m using Storefront to develop my site and i need to sort the products by rating at a specific part (using WP_Query).

I tried without success the following code in my $args:

$args = array(
    'post_type' => 'product',
    'orderby' => 'rating',
    'posts_per_page' => 5
);

Thanks!

https://www.ads-software.com/plugins/woocommerce/