While I cant imagine for the life of me why anyone would want to grow this noxious weed (at least in the tropics they are - in Vic well I doubt they would go weedy...) I would suggest soaking the seeds in hot (not boiling) water overnight, and also ensure bottom heat. I suspect that the soil could be just too cold down there at the moment to get them up.
I was forever battling these b@stards in my old house - they came over from my neighbours fence along with every other weed known to humankind. The seeds have a very long life span - up to 10 years Im told.
This was apparently one of those imported fodder crops that cattle wont eat and are just left to go weedy and spread through the bush. So while I doubt that they would do this in southern climates please just keep in mind the plants weedy potential.
They do have pretty blue flowers though...

footfullabindiis!! That's imaginative. Yes, I've germinated these, both single and double forms and here, just west of Twed Heads, they are too a bit of a problem, especially the single. I doubt they'll grow in Victoria but I soaked my little black seeds in warm to hot water and left them overnight and planted them in seed raising mix and up they came. And they self seeded around the garden for years after and still are. The double is less rampant than the single and is a much nice flower. The seeds are very hard, I also scratched the surface of a few and that helped with germination. But the previous seasons seeds in the soil come up anyway. To stop them being rampant pull away all the pea pods after flowering. Good luck.