Indiana Jones and The Gold Bust of Ramses II

Solution

Indy had a difficult time figuring out which key would safely
fit into which lock on which door...but he did manage, as
always, to unlock them all. Here is what he found:

The lead key fit into the silver lock on the door of Osiris.

The silver key fit into the gold lock on the door of Isis.

The gold key fit into the lead lock on the door of Anubis.

and...

The bronze key fit into the bronze lock on the door of Horus.