Sortable custom column in wordpress user list

// Prepend the new column to the columns array
function cb_user_extra_cols($cols) {
        //$screen = get_current_screen();
        //var_dump($screen);
    $cols['rdrole']  = 'Relativerdes Role';
    return $cols;
}

// Echo the ID for the new column
function cb_user_extra_col_value($val, $column_name, $user_id) {
        $rdrole_name = '';
    if ($column_name == 'rdrole'){
            $rdrole = get_the_author_meta('rdrole',$user_id );
            switch($rdrole){
                case 'driver':
                    $rdrole_name = 'Driver';
                    break;
                case 'parents':
                    $rdrole_name = 'Parents';
                    break;
                default:
                    $rdrole_name = 'None';

            }
        }
        return $rdrole_name;
}

function cb_user_extra_sortable_cols($columns) {
  //var_dump($columns);
  $custom = array(
      // meta column id => sortby value used in query
      'rdrole'    => 'rdrole',
  );
  return wp_parse_args($custom, $columns);
}



function cb_user_extra_orderby( $vars ) {
    if ( isset( $vars['orderby'] ) && 'rdrole' == $vars['orderby'] ) {
            $vars = array_merge( $vars, array(
                    'meta_key' => 'rdrole',
                    'orderby' => 'meta_value'
            ) );
    }
    return $vars;
}

function cb_user_extra_col()
{
    //manage_users_sortable_columns
    add_filter('manage_users_columns', 'cb_user_extra_cols');
    add_action('manage_users_custom_column', 'cb_user_extra_col_value', 10, 3);

    add_filter( 'manage_users_sortable_columns', 'cb_user_extra_sortable_cols' );
    add_filter( 'request', 'cb_user_extra_orderby' );
}
add_action('admin_init', 'cb_user_extra_col');