in reply to
Re^2: how do I force a specific session, not my own, to end? (delete)
in thread how do I force a specific session, not my own, to end?
In line with the previous post by anonymous, I think you're making this more complicated than it needs to be.
An approach that allows you to skip purging sessions is to create an active_disabled flag for user accounts and at the authorization/permissions level don't allow disabled users to see anything they shouldn't see on the site. That way all that needs to be done to disable a user is to change this flag.