Force local pick up if a product containing a specific shipping class is in the cart

woocommerce-force-local-pickup-specific-class.php

<?php

// Replace 'shipping-class' with the specific shipping class you want to force the local pick up upon
// To make it more readable, replace $shippingClass with your class name, eg : $hugeProducts

function my_hide_shipping_when_local_is_available( $rates ) {
    $cart_items = WC()->cart->get_cart();
    $shippingClass = false;
    
    foreach ( $cart_items as $cart_item ) {
		$product = $cart_item['data'];
		$class   = $product->get_shipping_class();
		
		if ( 'shipping-class' == $class ) {
			$shippingClass = true;
		}
	}
    
	$local = array();
	foreach ( $rates as $rate_id => $rate ) {
		if ('local_pickup' === $rate->method_id ) {
            $local[ $rate_id ] = $rate;
        }
	}
    
    if ( !empty($local) && ($shippingClass == true) ) {
        return $local;
    } else {
        return $rates;
    }

}

add_filter( 'woocommerce_package_rates', 'my_hide_shipping_when_local_is_available', 100 );