If an Avocado is not ripe then there's not much you can really do to actually ripen the Avocado in just minutes.
However you can make the Avocado a little riper and ready to eat by wrapping the Avocados in Tin Foil and then place the Avocados in the oven at 200 F degrees.
Place the Avocados in the oven for at least 10 minutes which helps it ripen enough to eat.
Placing the Avocados in the oven at 200 F for 10 minutes helps to soften the Avocados because it releases ethylene gas, which ultimately promotes the ripening of the Avocados.
You can also place the Avocados in the microwave for a few minutes which is supposed to help the Avocados ripen.