Saving model passing to other class

Hello, I'd like to use a saver class to store model and do some actions within a transactions, like on user registration page Id like to use like

$userModel = new User([....]);
$saver = new SaverClass($userModel);
$saver->save();

SaverClass.php would look like

SaverClass {
    __construct($model)

    save()
    {
        ...do something
        $this->model->save(); <-- this part is not working for some reason and no exceptions and erros appear anywhere in log files (php, mysql logs)
        ..do something else
    }
}```