Yes, gravity has that effect on objects which are not obeying it. What goes up must come down. But seriously can the hands be so little as to not be able to close it without slamming it or having the sense to keep it open with one hand if they are able to open what must be a three kg easily lid and this is after over comming the vacumn caused by the seal. You don't mention if its a half or full size chest freezer but I know of adults who have issues opening the full size ones.