If you have an extremely hard-to-open jar in the fridge, there are a few methods you can try to loosen it without breaking it:
Warm Water Soak: Fill a sink or a large bowl with warm (not boiling) water. Submerge the jar in the warm water, making sure not to get water inside the lid. Allow the jar to sit in the warm water for a few minutes. The heat will cause the air inside the jar to expand slightly, helping to release the vacuum seal and making it easier to open.
Rubber Gloves or Jar Gripper: Use rubber gloves or a jar gripper to get a better grip on the jar lid. The added traction can help you apply more force without the risk of slipping and dropping the jar.
Tap the Lid: Gently tap the lid on the side with the back of a spoon or a rubber mallet. This can help break the seal and make it easier to open.
Use a Towel: Wrap a dish towel or rubber band around the lid for added grip. This can help you get a better hold and apply more torque to open the jar.
Lid Lifter: There are various lid lifter tools available on the market that can help you get a better grip on stubborn jar lids and make them easier to open.
Run Under Warm Water: If you're unable to soak the whole jar, try running warm water over the lid only. The heat will again help release the vacuum seal.
Apply Light Pressure: Avoid using excessive force when trying to open the jar, as this can increase the risk of breaking it. Instead, apply steady, gradual pressure, using one hand to hold the jar and the other to turn the lid.
Seek Help: If all else fails, ask someone with stronger hands or more experience in opening difficult jars to give it a try.
Remember, sometimes jars can be exceptionally difficult to open, and there's a risk of breaking them in the process. Be patient and gentle, and if the jar simply won't open, it might be best to seek an alternative method of accessing the contents or consider discarding the jar if it's no longer needed.