Do you have a grace period function? Grace period mean once a member has expired after that he or she still can log in within 14 days. After 14 days ago, he or she account will be blocked.
We don't have that feature in the extension at the moment. The extension only has a feature which allow blocking users right after his subscription expired.
However, I don't think you should block subscribers. Blocking him will not allow him to login and renew his subscription in the future.
