After three failed login attempts, student accounts are locked for 30 seconds. After the 30 seconds have passed, if the student uses incorrect credentials again, the account is locked for five minutes. In both of these scenarios, a warning message displays on the login screen:
To allow a student immediate access to their account instead of having to wait five minutes to access it, you can unlock their account using the steps in Enabling Student User Logins. If the student cannot recall their password, after you have enabled their login, change their password. Reference Editing a Student Account for steps.