How to catch when session lifetime is over

Hi guys, I'm using Laravel with SSO (WSO2), everything is working but now I have a few problems... When the local session is expired before killing that session I need to logout from SSO. After doing a correct logout from SSO is going to redirect automatically to laravel in order to kill local session. So I need to create something in between in order to catch that event and do that correctly. Anyone know what I need to modify to achieve this?

Thanks a lot!