Extreme wait-time when taking a SQL Server database offline

Question

I\'m trying to perform some offline maintenance (dev database restore from live backup) on my dev database, but the \'Take Offline\' command via SQL Server Management Studio is

Answer 1

After some additional searching (new search terms inspired by gbn's answer and u07ch's comment on KMike's answer) I found this, which completed successfully in 2 seconds:

ALTER DATABASE  SET OFFLINE WITH ROLLBACK IMMEDIATE

(Update)

When this still fails with the following error, you can fix it as inspired by this blog post:

ALTER DATABASE failed because a lock could not be placed on database 'dbname' Try again later.

you can run the following command to find out who is keeping a lock on your database:

EXEC sp_who2

And use whatever SPID you find in the following command:

KILL 

Then run the ALTER DATABASE command again. It should now work.