Austin DeOrio

I just bought an 06 ruckus last week and it was able to drive and start fine, even in the cold (Michigan) I keep it outside but i do have a cover on it. The temperature has dropped a little bit and has started snowing the past couple of days. Two days ago I tried inserting my key into the ignition to start it up but the key wouldn't"t turn at all. I am not sure why this is happening, could be maybe it froze because of the cold, or could it be something wrong with the ignition as a whole? I tried using both my keys to start it but it wouldnt budge, and I am afraid to cause further damage if i keep trying. Any help on this?