If I remember correctly, they do have small lockers to hold your shoes, but it's not big enough for a snowboard. I've seen many many people leave their skis and snowboards outside on the racks and against the main building when they're inside eating at the cafe. So I'd recommend bringing some sort of lock to secure your board/skis if you decide to leave them on the rack. Personally, I've only been there 2 times (once per year), soon to be third, and I've rented a snowboard there and leaned it outside [with no lock] every time. By the time I finished lunch, it was still there. Hope I helped.
