The clutch will not depress at all. Does that mean that the pedal cannot be depressed or that the clutch does not disengage when the pedal is depressed?

If the clutch does not disengage when the pedal is depressed then either the master cylinder or the slave cylinder is leaking badly (check fluid level).

If the pedal cannot be depressed, the clutch master cylinder has failed. Unless you have the time and mechanical inclination to replace parts yourself, this is just time to call for a tow to the repair shop/dealership.

If you seriously want to hear about pushing the car until you can slip it into first and then slam shift and hope to avoid a complete stop on your way to the repair shop, I have only done that to really cheap cars.