Force local pickup

I’m creating an online shop for a friend of mine with the woocommerce-plugin. I would like to offer two different shipping methods to the customers. One the one hand a weight based shipping-option (I was able to do that with a plugin) and on the other hand the option to pick up products. But the pickup-option should only be available if there’s a product in the cart that has the “pickup-only” shipping-class.

Do you know how I could do that?

I’ve found the following code on github:

function hideShippingWhenPickupRequired($rates, $package)
{
foreach ($package['contents'] as $item) {
    $product = $item['data'];
    $shippingClass = $product->get_shipping_class();
    if ('pickup-only' === $shippingClass) {
        // The cart requires pickup
        return array(
           'local_pickup' => $rates['local_pickup'],
        );
    }
}
return $rates;
}
add_filter('woocommerce_package_rates', 'hideShippingWhenPickupRequired', 10, 2);

But it’s not working and even if it would, the pickup-option would still be available if there’s no product in the cart with the pickup-only-class.

https://ww.wp.xz.cn/plugins/woocommerce/