Please help me understand how to answer the physics question below; I think I get it, but I'm still a little confused. The subject is thermodynamics, specifically the first law of thermodynamics. Thank you.

A warm jar of pasta sauce is placed inside of a refrigerator and given time to cool down. As heat leaves the jar, some energy is removed from the internal energy of the sauce and some energy is removed from the work that the sauce does on the jar. Does this change cause the sauce to expand or contract? Will this change make the jar easier or harder to open? Why