One of the toughest things to open in the world would be sandwich spreads. Some of them will have been vacuum-sealed, which is a good security measure but leaves the user without access to the contents.
Get a spoon. Check to see if the cover has any spokes in it. If there is, form a wedge there with your spoon, as if ‘scooping’ up the spoke. Then slowly and firmly apply force to the wedge. Just wait until the vacuum seal breaks and air rushes inside. With the vacuum seal broken, it would be a piece of cake to open it.
What if the bottle doesn’t have spokes?