public static function getList()
    {
        $time = time();
        $return = [];
        
        foreach (self::find()->with('user')->all() as $item) {
            /* @var $item \luya\admin\models\UserOnline */
            $inactiveSince = ($time - $item->last_timestamp);
            $return[] = [
                'firstname' => $item->user->firstname,
                'lastname' => $item->user->lastname,
                'email' => $item->user->email,
                'last_timestamp' => $item->last_timestamp,
                'is_active' => ($inactiveSince >= (3*60)) ? false : true,
                'inactive_since' => round(($inactiveSince / 60)).' min',
                'lock_description' => Module::t($item->lock_translation, empty($item->lock_translation_args) ? [] : Json::decode($item->lock_translation_args)),
            ];
        }

        return $return;
    }