WooCommerce: To show Shipping Methods when Shipping Class exist

functions.php

    add_filter( 'woocommerce_package_rates', 'show_shippingpro_method_when_shipping_class_product_is_in_cart', 10, 2 );
    function show_shippingpro_method_when_shipping_class_product_is_in_cart( $available_shipping_methods, $package ) {
        $shipping_class_ids = array(
        16);
        $shipping_services_to_show = array(
            'wf_woocommerce_shipping_pro:Group1Express',
            'wf_woocommerce_shipping_pro:group2Standard',
        );
        $shipping_services_to_show = array_map('strtolower', $shipping_services_to_show);
        $shipping_class_exists = false;
    
        foreach( WC()->cart->cart_contents as $key => $values ) {
            if( in_array( $values[ 'data' ]->get_shipping_class_id(), $shipping_class_ids ) ) {
                $shipping_class_exists = true;
                break;
            }
        }
        
        if(!$shipping_class_exists ) {
        foreach ( $shipping_services_to_show as &$value ) {
                unset( $available_shipping_methods[$value] );
            }
        }
    
        return $available_shipping_methods;
    }