Living in the Northwest, many times our produce is not quite ripe when available. Pears and avocados can be hard and green, especially from Costco. To nicely ripen them up I throw them into a pretty covered candy dish on my table or counter top. It’s a beautiful display and the natural gasses the fruit gives off will gently ripen up any fruit within a couple day.
To stop this natural ripening process, just take them out or open the top. Ready to eat in a jiffy.