Samsung Galaxy S 4 (Verizon / Sprint)

😢 I bought a used in excellent condition s4. Worked perfect on arrival. 3rd day volume button got stuck. Took to repair shop, 5 minute fix. After leaving, external speaker not working at all. Shop closed for the weekend now and I need my speaker.
Any ideas on what I might do to recover speaker? I have checked my setting and even did a factory reset....still no speaker. Help, please!!!!