Its completely voluntary. No one can force you to go out in service. Nothing will be done if you decline to participate. There are probably tens or hundred of thousand "inactive" JWs.
Further, being a JW is completely voluntary. Anyone can leave at any time.
How's that for Devil's advocate? But the sad part is its all true. Jws are basically in their own self-contained prison, they can get out of this prison at any time, they just don't realize it.
No Apologies