Place chuck roast at the bottom of the instant pot
Pour in the blended sauce
Add seasonings and cilantro. Mix well
Securely close the lid and set vent to "sealing". Press "Manual", then press "pressure" until it says "high pressure". Then adjust the timer to 75 minutes. Let it cook, and then follow the manual instructions to turn the vent to "venting" and wait until all the steam has released and the valve drops.
Remove the lid. Shred the beef using two forks. Serve with a bowl of rice, on top of nachos, or with salad.