Pressure Cooker Lemon Chicken

chicken thighs and/or legsSalt and pepper, to taste3 Tbsp Butter, unsalted1 Tbsp Olive oil½ Onion, minced1/4 c White wine1/2 c Chicken broth1 1/2 tsp Lemon zest1/4 c Lemon juice1 Lemon thinly sliced1 c Kalamata Olives