It only had cold contact with treif, if any (only if the food reaches to top of the can); no duchka de sakina was involved.
Its contact with my kosher food is also cold - if any (only if the food reaches to top of the can).
Is it okay to use it?
According to the OU - it may be used after they are cleaned and rinsed off.
Q. The lunch area in our office has a can opener, peeler, bread-toaster (not a toaster oven), flatware, coffee mugs, glass dishes and glass cups available for anyone to use. Can I use them? A. The can opener and peeler can be used after they are cleaned or rinsed off.