How can I unlock my MacBook Air

Please define "locked".

Did you forget your login password?

Did you forget your file vault password?

Is the computer remotely managed?

Is it a used computer you just baught?

Hi Alfredvokrri,

If you forgot your login password, you can reset that using these steps: https://support.apple.com/en-us/HT212190

If that article doesn't help resolve the issue, can you please describe the screen and the kind of lock that your Mac shows?