Insert the end of a cutlery knife between the rim of the glass jar and lid from below. Give it a tiny wiggle, and the jar will pop open. At least if it’s stuck because of a vacuum.
If that didn’t work, poke a tiny hole in the lid with a sharp object to break the vacuum, but please be careful if using a kitchen knife for this! A nail or a screw is probably a safer choice.
Insert the end of a cutlery knife between the rim of the glass jar and lid from below. Give it a tiny wiggle, and the jar will pop open. At least if it’s stuck because of a vacuum.
If that didn’t work, poke a tiny hole in the lid with a sharp object to break the vacuum, but please be careful if using a kitchen knife for this! A nail or a screw is probably a safer choice.
You might think that the knife frees the vacuum and that that’s what opens the jar. Lies. You must inflict fear upon the jar with the knife.