WooCommerce Hide Shipping when Pickup Required

functions.php

<?php
function wdt_hide_shipping_when_pickup_required( $rates, $package ) {

    $class_slug = 'pickup';

    // Checking in cart items
    foreach( WC()->cart->get_cart() as $cart_item ){
        // If we find the shipping class
        if( $cart_item['data']->get_shipping_class() == $class_slug ){
            unset($rates['flat_rate:2']); // Remove flat rate
            unset($rates['free_shipping:3']); // Remove free shipping
            break; // Stop the loop
        }
    }
    return $rates;
}
add_filter('woocommerce_package_rates', 'wdt_hide_shipping_when_pickup_required', 10, 2);