Can your pet open doors?

My cats are not good at opening doors. Maybe that's because the door is too heavy for them. Or maybe they find it easier to just go out by climbing up to the rafters and passing through the gaps between the roof and the wall. That works for the big ones. The small ones will have to wait for me to open the door for them. Sometimes, they just sit around the front door facing out. That's when I know they want to go out.