This reads as if either the clutch master cylinder or the clutch slave cylinder has failed. If it's the slave cylinder then there may be fluid on the friction surfaces of the clutch and it will need a new clutch. In the circumstances there's no harm in trying some fresh fluid but you will then need to bleed it through at the slave cylinder end because there will otherwise be an airlock. I doubt this will work, but it will be a lot cheaper than a new clutch if it does work.