The lid lock is sucked, not open, how to do?
Boil it in hot water for a period of time and then open it when you take it out.
Put it in hot water and keep it warm. When the temperature is high, the pressure inside it decreases and you can open it
The box heating air expanded, discharged outside the box; when the heating and cooling time, but due to cold air, the lid is sealed, outside of the box to go into the air, negative pressure is formed inside the box, so open, add a little warm, generally can be opened.
