Search Results in Ascending (Alphabetical Order)

The results on search and category results do not appear to be coming back in alphabetical order and I am wondering what I need to do about this.

I have added the following snippet to code snippets but it does not seem to be working.

add_filter(‘geodir_posts_order_by_sort’,’_my_custom_order_by’,10,3);
function _my_custom_order_by($orderby, $sort_by, $table){
global $wpdb;

if($sort_by==’is_featured_asc’){
$orderby .= ” $wpdb->posts.post_title ASC, “;
}
return $orderby;
}

Do you have any ideas? Thanks!