My Mac is locked and asking for a passcode

Hi arlicia262,

If the passcode is regarding Screen Time (an app tells you that time is up), P. Philip's answer is correct.

If you see a grey screen with a passcode entry field on it, with the options "Sleep", "Shut Down", "Restart", your Mac was locked via Find My Mac. You may be able to retrieve it online using a computer. On your computer, click this link to access Find My: https://icloud.com/find

Set, change, or remove a Screen Time passcode on Mac

The Administrator of this computer will need to be contacted for the passcode.