How to sanitize really is determined by when you want to use them. If you know on brew day you want to oak it in secondary, and are palnning to secondary it after two weeks or a month, then soaking them in a mason jar with jack for 2-4 weeks is perfect. The booze should kill all the critters off.
If I suddenly wake up and decide that I might want to oak some beer I wasn't planning on before. Then I steam them, and while they are hot and the pores are open I drop them in a jar of jack and let them sit for an hour or two to absorb, then drop the whole shebang in.