make gpg-agent forget the PIN

[Johannes Zarl]

Hi,

I'm trying to get gpg-agent to automatically forget my credentials as soon as 
I leave the PC/the screen is locked. So far, I only got it half working:

When I send a SIGHUP to the gpg-agent, it correctly forgets cached 
passphrases. The cached PIN of my OpenPGP card, however remains available.

Is there any way to explicitly tell gpg-agent to forget the pin as well?

Cheers,
  Johannes