I can pretty much always open them. Usually just with muscles, if not I escalate: bounce the rim of the lid on something hard, run hot water over the lid, and as the last measure, jam a knife under the rim of the lid from below.
The last one feels a bit like admitting defeat tbh because it might damage the air-tightness of the container. But it usually doesn't. Much better to gently pry around the whole circumference than to stick it in one place and actually bend it.