Instant Pot: Press the “Meat” setting and then press the “Pressure” button until the light on “High Pressure” turns on. Set the time to 40 minutes using the up and down arrows Cook and let the steam naturally release. Carefully remove the lid and shred using two forks. Crockpot: Cook on low for 8-9 hours until the pork is fork tender.
For crispy carnitas, cover a baking sheet with foil. Turn the broiler on high. Spread the meat out on the baking sheet. Broil for 4-6 minutes until crispy. Toss with some of the cooking juice after broiling to add moisture back to the pork, for about 15 minutes. Carefully remove the lid and shred using two forks.