Why won't my beans soften?

I have an old jar of 9 bean soup mix which is basically dried beans. In order to cook them, they must first be softened and according to some prior research a few methods exist, though the most common method is to soak the beans over night. I have done just that. They have been soaking for more than 12 hours now and they are still quite hard. When I began soaking them I used boiled water from the kettle so that the process might be sped up.
Is there a better way to go about this?
Would adding an acid help to soften the beans?
Am I doing something wrong?

Link 1: https://cooking.stackexchange.com/a/3...


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