Laravel 5 lockscreen

So, I'm doing this app in Laravel and my client wants it to have a "lockscreen" after 3 minutes of inactivity, something like what new PayPal site is doing. So if you're not active for 3 minutes you are presented with lockscreen view and you have to type in your password to retrieve the session.

It would be awesome if I could achieve this without messing with core files, like via controller and new middleware.

via Chebli Mohamed