Accessing Disabled Accounts via ssh

We have user accounts on our OS X Tiger Server where the user has installed a public key into their ~/.ssh/authorized_keys file.
The problem:
If I uncheck "access account" in Workgroup Manager for one of those users, they can still login to the server via ssh, authenticating with their private key.
So, how can I truly disable access to an account that has a key pair installed for ssh?
  Mac OS X (10.4.5)  

Have you tried using WGM to change their login shell to "none"?

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