That sounds like something has gone awry where the lever that the clutch pedal operates fits into the bellhousing. Without the engine running, can you freely move the gear lever from slot to slot, and if so does it feel 'right'?
I think there might be only two options. If the road is quiet and there aren't too many traffic lights on the way home, start the car in first gear (it'll lurch a fair bit!). Once it's rolling, it's possible to change gear up and down. Change down by slipping the lever into neutral, blip the throttle a good bit, then the lever should slip into the next gear down. Up changes are done by slipping into neutral, then pressing the lever home to the up change.
Failing that, I think it's a recovery job, tow or trailer home/to garage.