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I keep seeds at room temperature in an airtight container and that has done fine for me with 8+ year old seeds. I think if you're gonna freeze 'em you gotta make sure they're not gonna die through constant freeze/thaw cycles
I didn't even know my plant hermed and made seeds until after I trimmed and jarred it.
I poured the buds out to dry up more and a few seeds fell out of the jar.
It's not really about seeing them open in the water though, that is just to get them wet. After a few hours of soak they sink to the bottom with a little tap. That's when most people take them out of the water. I'm pretty sure oxygen is required for germination.