Restricts WooCommerce local pickup for minimum order amount

gistfile1.php

/**
 * Restricts WooCommerce local pickup for minimum order amount
 * Change $min_amount to the integer amount you want to set as the minimum.
 */

add_filter( 'woocommerce_shipping_local_pickup_is_available', 'wcs_pickup_min_amount', 10, 2 );
function wcs_pickup_min_amount( $is_available ) {

	if ( ! $is_available ) {
		return $is_available;
	}

	$has_met_min_amount = false;
	$min_amount = 40;

	if ( WC()->cart->prices_include_tax ) {
		$total = WC()->cart->cart_contents_total + array_sum( WC()->cart->taxes );
	} else {
		$total = WC()->cart->cart_contents_total;
	}
	
	if ( $total >= $min_amount ) {
		$has_met_min_amount = true;
	}

	return $has_met_min_amount;

}

Hi,
That's a great code. But I need to display an error message when $min_amount < 40.
Could you suggest me please?
Thank you.

Thank you @bryceadams!