How to do the exception on automatically sign off users after they have been disconnected?

Question

Hi all, this is my first post here. I would like to explore if there is a way to make an exception?

I have modified a group policy and set the time limit for disconnected devices to 5mins. However, I have a service account that cannot be logged off because it is required to run the scheduled task. Do you have any idea to make this service account stays active but other users will be logged off automatically after disconnected 5 mins?

Thanks!!