Instant Pot BBQ Beef Sandwiches

Name: Instant Pot BBQ Beef Sandwiches
Ingredients: 1 tbsp. chili powder; 1 tsp. ground cumin; 1 tsp. smoked paprika; 1 tsp. kosher salt, plus more to taste; 1/4 tsp. cayenne pepper; Black pepper, to taste; 1 2 1/2- to 3-pound piece boneless beef chuck roast, trimmed and cut into 5 or 6 pieces; 1 tbsp. vegetable oil; 1/2 c. ketchup; 1/2 c. apple cider vinegar; 2 tbsp. molasses; 2 tbsp. packed light brown sugar; Hot sauce, to taste; 6 sesame hamburger buns, split and toasted; Coleslaw and pickles, for topping; Potato chips, for serving