Thor
From WikiRaider
Thor is a room called in St. Francis Folly from Tomb Raider I.
If you enter the room, their hanging a sphere above you that attack with Lightning bolts.
In the next large room you see a large hammer.
Stand on the platform until it clicks and then run away. Lara will be dead if you stand still on the platform.
After the hammer slam on the platform, 2 Moving blocks will drop from above. and move them to get the Thor Key.