Sort the search results on the member search by a custom field

I've attempted to write some code for this. Would this work as a widget extension?

public class MyUsers
    {
        public Telligent.Evolution.Extensibility.Api.Entities.Version1.SearchResults GetUsers(int pageIndex, int pageSize, string filters, string query)
        {
            ISearchResults search = Apis.Get<ISearchResults>();
            var searchOptions = new SearchResultsListOptions
            {
                PageIndex = pageIndex,
                PageSize = pageSize,
                Query = query,
                Filters = filters
            };
            searchOptions.Sort = "UserSortOrder";
            var results = search.List(searchOptions);
            return results;           //Apis.Get<Users>().List(options);

        }

        public void BeforeSearchBulkIndexingEventHandler(BeforeBulkIndexingEventArgs e)
        {
            SearchIndexDocument d = new SearchIndexDocument();
            d.AddField("UserSortOrder", GetSortOrder(d.ContentId));
            e.Documents.Append(d);
        }

        private string GetSortOrder(Guid contentId)
        {
            SqlDataAccess sd = new SqlDataAccess();
            using (SqlCommand cmd = sd.GetCommand("ibby_UserSortOrder_Get"))
            {
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@ContentId", contentId);
                DataTable dt = sd.Execute(cmd);
                if (dt.Rows.Count > 0)
                    return dt.Rows[0]["UserSortOrder"].ToString();
                else
                    return string.Empty;
            }
        }
    }

You are not longer writing a widget extension.  You are writing a plugin and possibly modifying widget code.