Automatic Logout the User after "X" time in Sharepoint 2013

Hello,

         I need to logout the user in SharePoint 2013 after x amount of inactive time. I tried these options:

        -Modify the <authentication><form> node with the timeout attribute.

        -Run some PowerShell code to modify the LogonTokenCacheExpirationWindow, FormsTokenLifetime and UseSessionCookies.

        -Build a custom Global.ajax.cs to subscribe to the SessionSecurityTokenReceived Event.

        -Modify the setting "Security validation expires" in Central Administration.

Neither of this solution just mentioned solve the problem, the user continue logged in the site after X amount of time.

The web application is using FBA with Membership.

Any solution?

Thanks.