clutch pedal on the floor
 

Hello
I have a 9-3 aero 2.0 t on a 56 saloon with 112.444 miles
Parked the car up and after 30 minutes went to start up and clutch pedal stuck to the floor with very little clutch , Managed to get home and switched off and left it for a while and then went to try it and the pedal had come up and worked fine , Please what is wrong if anything ?
Help appreciated
thanks