You can soak for a while using 3% hydrogen peroxide. You’d have to google how long I can’t remember. You can also use a fine grit sand paper and scuff the edges. I prefer the sand paper method, then I soak for 8 hours in RO water, then do the paper towel method. Keep in mind even if you get them to germinate, they may not grow properly. I’m like a 75-80% success rate of healthy plants with old beans.