Laravel 4.2: not able to log out user -

I am trying to log out the user:

  public function getSignOut ( } {AUTH:: People Out (); Return Redirection: From ('/'); }  

However, when it kills this route:

  Root :: find ('/', function () {if (auth :: Check ()) {back to 'log in';} other {back 'no login';}});  

It gives that the user is still logged in. What can be the problem to help solve the problem and thank you in advance.