Get last order info PHP

Hi,
I have a code that successfully creates a shortcode for any customer’s last order. It gets the order details of the last order of a logged-in user. Instead of this, I need a code that gets the last order info regardless of any customer whether they’re logged in or not.

add_shortcode( 'custom-woocommerce-total' , 'custom_total' );
function custom_total(){
    $customer_id = get_current_user_id();
    $order = wc_get_customer_last_order( $customer_id );
    return $order->get_total();
}