Need Help with a Sigma 28-80mm lens

[garrey88]

Hi, I'm shooting with a Canon Rebel Eos and the Sigma 28-80 is giving me some problems. I've never really used a Canon before, I'm used to using a Nikon D40. I was shooting earlier and everything was fine but suddenly it stopped letting me zoom. The lens seems to be stuck, I can't rotate it in either AF or Manual. Does anyone know how to repair this quickly or would I need to look for a repair place?