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Ad to unlock it, use the 
-u
 option:
sudo passwd -u
However, locking an account will not prevent the user from logging in if they have 
access to the server via SSH while utilizing public key authentication. In that case, 
you'd want to remove their ability to use SSH as well. One common way of doing 
this is to limit SSH access to users who are members of a specific group. When you 
lock an account, simply remove them from the group. Don't worry so much about 
the SSH portion of this discussion if this is new to you. We will discuss securing your 
SSH server in 
Chapter 21
, 
Securing Your Server
. For now, just keep in mind that you 
can use 
passwd
 to lock or unlock accounts, and if you utilize SSH, you'll want to lock 
your users out of that to prevent them from logging in.
However, there's more to password management than the 
passwd
 command, as we 
can also implement our own policies as well, such as viewing or adjusting password 
expiration details.