I know you can unlock normal Sitecore users from user manager by login in to Sitecore backend, as admin user.
Is there any way to unlock Sitecore admin user, when the user account gets locked?
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In addition to the answer above, if you have the misery of forgetting the Sitecore password then this will save you:
UPDATE [aspnet_Membership] SET [Password]='qOvF8m8F2IcWMvfOBjJYHmfLABc=', [PasswordSalt]='OM5gu45RQuJ76itRvkSPFw==', [IsApproved] = '1', [IsLockedOut] = '0' WHERE UserId IN (SELECT UserId FROM dbo.aspnet_Users WHERE UserName = 'sitecore\Admin')
It resets the password to the classic 'b'.
There is also an admin page:
By default, it's disabled so you need to edit the aspx file to set enableUnlockButton to true.