Short search seemed to confirm my thoughts. Most ancient sites are not guarded by elaborate traps or secret riddles to get in. From what I’ve found there were some crossbows here and there. Some rare hidden rooms with a lot treasure, but again, no traps.
I’m not sure about a pharaoh’s tomb, but there were rivers of mercury in the tomb of the first Emperor of China; also automatic crossbow traps I believe. It’s the tomb with the Terracotta Army. Extremely fascinating.
https://www.futura-sciences.com/en/this-tomb-is-a-deadly-trap-archaeologists-still-refuse-to-open-it_17867/
https://www.labrujulaverde.com/en/2020/01/rivers-and-seas-made-of-mercury-inside-the-tomb-of-chinas-first-emperor-sealed-2200-years-ago/