Is there a way to programmatically add IP addresses to the blocked IP address list?

I'd like to write a program that responds to a failed-logon event and if
the username is in a honeypot list of usernames programmatically add that IP to the blocked list.

I see that the IPs in the list are stored in serv-u.archive, is it as simple as appending the block of lines associated
with those entries to the serv-u.archive file?

Thank you!

Bryan