Allow me to share my secret nerdy moid tech.
The reason the jar is hard to open is that it's vacuum sealed. So the easiest way to persuade it is to let in some air into the jar!
If this is a metal lid we are talking about, it should be flexible and you should be able to insert some sort of prying tool in between the glass and the side of the lid, and gently twist the prying tool in order to slightly bend the lid away for but a brief moment. This will break the seal allowing air in, undoing the vacuum. The jar should be easy to open afterwards.
WARNING: one important thing here is to be gentle, you want to be careful not to chip the glass as you are doing this! It would be best to use something that isn't metal, like some hard wood chopstick or something? Or perhaps something like that plastic blue ifixit spatula?
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I myself usually use this shitty dull old vegetable peeler I have that looks like pic below, but that's because I'm well versed in this forbidden tech. As a noob, you should probably not be using a metal tool for this!!
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Once you get the hang of it it makes opening any jar easy peasy.
EDIT: Found a
youtube video demonstrating the technique, here it is for future reference:
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