public boolean isBlocked() {
        return isValid() && failureCount.get() >= maxAttempts;
    }
Returns whether the user/address causing this authentication failure
should be blocked based on the restrictions provided at construction
time.

@return
    true if the user/address causing this failure should be blocked,
    false otherwise.
extensions/guacamole-auth-ban/src/main/java/org/apache/guacamole/auth/ban/status/AuthenticationFailureStatus.java