Last tested: April 2021
This error comes up if you try and log in with a bad password too many times.
You only have to wait 5 minutes for it to unlock. This is non-negotiable, however you can instead use SAML/LDAP which may have providers that allow you to change these settings.
Docs: https://docs.looker.com/admin-options/settings/login-lockouts
This content is subject to limited support.