Ericmgf

Could anyone help please?
Just been out for a run in my MGF and when I approached my drive went to select first gear to pull the car on the drive and couldn’t get any gear whatsoever, also the clutch pedal went to the floor and felt like it had no pressure.
Went in the house to get changed and have a look but when I returned to the car and started it up again everything worked fine, pressure in the clutch pedal and all gears available!
Is this a sign of a faulty clutch slave cylinder or something worse? Any help gratefully received….has this happened to anyone else?