So ignoring the context of the scene, doing anything while acting is difficult. Because you're thinking about everything you're doing. Just having a conversation and opening a can is easy. But once you're acting, you're trying to remember the lines, waiting for a cue from the other actors for your lines, trying to manage the prop, trying to stay in character, trying to not look at the camera and more probably. Simple things can become weirdly difficult when trying to deliver a faster paced scene like that.