When you try to login with the wrong details your account will be locked.
You will get a red warning stating:
"account is locked,
please ask a new paswoord"
When an account is locked an Admin can UNLOCK the account.
1. Simply go to the profile in users.
2. When a user is locked their will be an orange warning stating "employee is locked"
3. Click on "unlock", when necessary also reset the paswoord.