Can I harvest seeds from a fresh tomatillo?

[peebee]

This has been the first year I started cooking with tomatillos. I bought them at the store, so next year I want to grow my own. It seems from reading here, they reseed easily, so I'm wondering if I can just get seeds from a fresh one, wait for it to get softer maybe, and dry them? Or do I need to wait for the fruit (on the vine) to mature, somewhat like for eggplant or cucumber seeds?

Thanks!