The locked account happens when the user enters their passwords incorrect more than 5 times or an incorrect MFA. The user needs to wait to be able to try again. The system will show you an error message saying: "Sorry, your account has been locked. ". 

Once the account is locked, even if you add the correct email or password you will need to wait until the account is unlock. Please be aware that if you keep trying the system will add extra time for every attend. So, If you cannot remember the password, please wait 10 minutes and go to the login page and click "Forgot your password".