The landings occurred in the lunar "morning". Remember, the lunar day is around 14 Earth days long, as is the lunar night. So, on landing, the surface temp was not really "hot". It takes time for the shallow sun angle to start warming the rocks and dust after the long cold dark night...
I have frozen aluminum sitting on my desk here, the aluminum pan for a pot pie. "Frozen" simply implies it's in a solid state.
The spacecraft cabins were kept at comfortable temperatures via environmental control systems. The big problem of the spacecraft wwas excess heat, not from sunshine or some radiation, but from the onboard electrical equipment. This was shed as needed via radiators (not to be confused with your car's "radiator", which needs an atmosphere).
I'm not an expert, but you have come to the right place if you are interested in learning the science behind the challenges of spaceflight, and how they dealt with them. It's absolutely fascinating stuff, and several folks here deal with it routinely in their work with spaceflight and spacecraft. Yes, it's what they "do" for a living!
Welcome aboard, be ready to learn.