The plastic lunch box has just been heated in the microwave oven for dinner, and the lid won't open.
When heating, you must open the lid to breathe, otherwise the hot air will not come out. If there are no dishes that need to be covered, you can heat them directly without covering. Because microwave heat-resistant plastic boxes are not suitable for putting oily food, it is best not to use plastic boxes to heat meals every day. It is best to use ceramic containers or heat-resistant glass containers to heat meals.