Get cusotm field info using get_post_custom_values

hi there,

I’ve added an expiry date to posts using the code below – I’d like to show this date under the permalink much like the meta info. How would I go about doing this using the code:
<?php get_post_custom_values($key, $post_id); ?>

Post expiry function:

<?php
if (have_posts()) :
     while (have_posts()) : the_post(); ?>
         $expirationtime = get_post_custom_values('expiration');
         if (is_array($expirationtime)) {
             $expirestring = implode($expirationtime);
         }

         $secondsbetween = strtotime($expirestring)-time();
         if ( $secondsbetween > 0 ) {
             // For exemple...
             the_title();
             the_excerpt();
         }
     endwhile;
endif;
?>

Thanks in advance!