Place the 6 skinless chicken breasts in the slow cooker in a single layer if possible.
Pour the entire bottle of Sweet Baby Ray's BBQ sauce over the chicken.
Add 3 tablespoons Worcestershire sauce, 1 tablespoon Sriracha, and 1/4 teaspoon red pepper flakes on top of the sauce.
Cover and cook on High for 3 hours.
Use two forks to shred the chicken directly in the slow cooker until shredded to your liking.
Stir the shredded chicken into the sauce, then cover and cook on Low for 1 hour to meld flavors.
Serve hot with rolls, rice, or prepared coleslaw.