Woocommerce add user role at time of purchase based on product ID

gistfile1.txt

/* ADD USER ROLE BASED ON PRODUCT ID */
function change_role_on_purchase($order_id) {
    $order = new WC_Order($order_id);
    $items = $order->get_items();
    
	foreach ($items as $item) {
        $product_name = $item['name'];
        $product_id = $item['product_id'];
        $product_variation_id = $item['variation_id'];

        if ($order->user_id > 0 && $product_id == '62') {
            update_user_meta($order->user_id, 'subscriber', 1);
            $user = new WP_User($order->user_id);
// Remove role
            $user->remove_role('subscriber');
// Add role
            $user->add_role('subscriber');
            $user->add_role('silver');
        }
    }
}
add_action('woocommerce_order_status_completed', 'change_role_on_purchase');