Spring spontaneously broke in half?

Door stopped working. I discovered the spring seems to have broke in half. Door is only 4 years old. It’s a spring, so I need to call an expert, right? Any guess on the cost?

Door stopped working. I discovered the spring seems to have broke in half. Door is only 4 years old. It’s a spring, so I need to call an expert, right? Any guess on the cost?