Set minimum shipping rate for a shipping method

functions.php

add_filter('woocommerce_package_rates', 'wf_ups_min_rate', 10, 2);
	
function wf_ups_min_rate($available_rates, $package)
{
	$min_shipping_rate	=	10;
	foreach($available_rates as $rate_key => $rate){
		if($rate->method_id == 'wf_shipping_ups' && $rate->cost<$min_shipping_rate){
			$available_rates[$rate_key]->cost	=	$min_shipping_rate;
		}
	}
	return $available_rates;
}