Php 会话注销处理程序存在错误

我试图实现会话注销功能，但我的实现似乎有缺陷。对于初学者来说，超时是不一致的，似乎在不同的时间注销用户。此外，当用户注销时，它不会将他们重定向到我指定的登录URL，而只是停留在屏幕上，用户知道他们注销的唯一方式是单击链接

请尽我所能提供帮助，并提前感谢您的建议：

<?php

namespace Main\UserBundle\Component\Session\Handler;

use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Symfony\Component\Routing\RouterInterface;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\Security\Core\SecurityContextInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\KernelEvents;

class SessionIdleHandler implements EventSubscriberInterface {

    protected $session;
    protected $securityContext;
    protected $router;
    protected $maxIdleTime;

    public function __construct(SessionInterface $session, SecurityContextInterface $securityContext, RouterInterface $router, $maxIdleTime = 0) {
        $this->session = $session;
        $this->securityContext = $securityContext;
        $this->router = $router;
        $this->maxIdleTime = $maxIdleTime;
    }

    public function onKernelRequest(GetResponseEvent $event) {
        if (HttpKernelInterface::MASTER_REQUEST != $event->getRequestType()) {

            return;
        }


        $request = $event->getRequest();
        if (!$request->hasSession()) {
            return;
        }

        $session = $this->session;
        $session->start(); //on every page request the session is restarted
        $session_data = $session->getMetadataBag();

        $lapse = time() - $session_data->getLastUsed();

        if ($lapse > $this->maxIdleTime) {

                $session->invalidate();
                $this->securityContext->setToken(null);
                $this->session->getFlashBag()->set('info', 'You have been logged out due to inactivity.');
                $event->setResponse(new RedirectResponse($this->router->generate('fos_user_security_login')));

        }
    }

    public static function getSubscribedEvents() {
        return array(
            KernelEvents::REQUEST => array('onKernelRequest', 127),
        );
    }

}

在我的parameters.yml中

session_max_idle_time: 3600

session_max_idle_time: 3600