WooCommerce - Show only products below a certain price

<?php
// WooCommerce - Show only products below a certain price
add_action( 'woocommerce_product_query', 'custom_product_query' );
function custom_product_query( $query ) {
  $meta_query = $query->get( 'meta_query' );
  $meta_query[] = array(
    'key'     => '_price',
    'value'   => 20,
    'compare' => '<=',
    'type'    => 'NUMERIC'
  );
  $query->set( 'meta_query', $meta_query );
}