Logout and redirect from component

In a custom component I am making API calls. If the API call returns 403 I want to logout the user and redirect to the login. 

        $this->Cookie->delete(TOKEN);

        $this->Cookie->delete(USER);

        $controller = $this->_registry->getController();

        $string = $controller->Auth->logout();

        $controller->autoRender = true;

        return $controller->redirect($string);

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