The Crisco today is not the Crisco of my youth. Old oils and fats can still be used in an oil lamp or candle with the right wick system.It's in plastic tubs, with the tear off plastic strip seal. If you open it up, it has a thin plastic sheet over the top of the lard. Probably ok. I keep expired Crisco, too, figure I could use it the same way. I use Crisco in cooking, but usually not lard. Mostly use olive oil in our everyday cooking. So much of the "vegetable oil" sold is just soy bean oil. I try to stay away from soy in my diet.
One option with the lard is to put it into pint or half-pint jars and can it like you would any meat product. Canned it would keep indefinitely and once opened it would keep for an extended period.
Lard was used as a means to preserve meat so the lard itself will keep for an extended period.