Can get pedal down, can't get into gear. Could be clutch/gearbox/anything I guess.
Probably hydraulic failure. If it’s an external slave cylinder not too bad, if it’s a concentric slave cylinder will probably mean a new clutch as it would have more than likely contaminated the clutch with fluid. If it’s a diesel then more than likely dual mass flywheel will need replacing as well which isn’t a cheap job at all.
Uncommon but not unheard of for it to be a clutch master cylinder.