Set the Instant Pot to Sauté/Sear and add the vegetable oil.
¼ cup vegetable oil
While the oil heats, season the pork evenly with salt, pepper, and garlic powder.
3 to 4 pound pork butt , 4 teaspoons kosher salt, 1 teaspoon black pepper, 1 teaspoon garlic powder
Dissolve the Sazón Goya packets into the cup of water, pour mixture over the roast.
2 Sazon Goya , 1 cup water
Squeeze juice from the oranges over the pork, then add the squeezed oranges to the pot.
2 oranges
Secure the lid, set the valve to Sealing, and cook on Meat/Stew (High Pressure) for 1 hour and 15 minutes.
Allow a 10-minute natural release, then carefully release remaining pressure.
If the pork is not fork-tender, pressure cook for an additional 15 minutes, followed by another 10-minute natural release.
Discard the oranges. Shred the pork and serve on buns, in tacos, or in bowls.