Hi,
The auto logout is not fired immediately after 30s of inactivity, it depends also on the USER_AGENT timeout that is set to 300s by default. Because as there is no activity, the user-agent is only notified of the logout at next request it fires, and this is at USER_AGENT timeout.
Can you try to reduce the USER_AGENT timeout to 60s, you should get logged out after one minute.
Frank