If the password is related to an individual user account, you can ask your system administrator to reset a new password for you to login to the MS SQL Server. But if the SA is not available or the lost or forgotten password is related to system administrator account, you can reset a new password by using Windows Authentication.

Read this blog: How to Reset SQL Server Passwords Manually?[/url]

You will get some manual solutions in the blog by using which you can unlock your MS SQL Server.

Hope this blog would be helpful.

Thanks. 🙂