The same thing happened to me when I picked up my new Cayman and drove it home. The clutch stuck on the floor and would not spring back. I was able to lift the clutch with my hand. The dealer first replaces the master cylinder and the problem recurred. The dealer then replaced the slave cylinder and the car has been great since. This is a well documented issue by others in these forums.

Also. I noticed a bit of hydraulic fluid dripping under my car in the garage. I caught it in a plastic container and showed the dealer to help them troubleshoot.