In a small bowl, whisk the ketchup, chili sauce, lemon zest, 1/2 tbsp lemon juice, Old Bay seasoning, and sriracha chili sauce then refrigerate to cool
Preheat the oven to 450F
Place the butter, garlic, remaining ½ tbsp of lemon juice, and crushed red pepper in an 8x8 baking pan
Place the pan in the oven and let the butter melt, about 3-5 minutes
Add the shrimp to the pan, turning to coat in the butter mixture
Roast in the oven for about 10 minutes, flipping the shrimp once halfway through
Sprinkle the shrimp with parsley, salt, and pepper