[WooCommerce 3.0] make NZ region compulsory in checkout page

wc-req-nz.php

add_filter( 'woocommerce_billing_fields', 'woo_filter_state_billing', 10, 1 );
add_filter( 'woocommerce_shipping_fields', 'woo_filter_state_shipping', 10, 1 );

function woo_filter_state_billing( $address_fields ) { 
  $address_fields['billing_state']['required'] = true;
	return $address_fields;
}

function woo_filter_state_shipping( $address_fields ) { 
	$address_fields['shipping_state']['required'] = true;
	return $address_fields;
}
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Hi - just trying to apply this now (to functions.php?) - and it doesn't seem to be working. Have you made any edits to this recently to keep it current?
Need region to be compulsory for shipping calculations to work properly...
Thanks

//Make Region (State) required
function custom_nz_locale($locale){
  $locale['NZ']['state']['required'] = true;
  return $locale;
}
add_filter('woocommerce_get_country_locale', 'custom_nz_locale');