You cannot open the lock to enter Olympus. After you have found the 5 sacred items and they are taken by Zeus, Hercules will help you reach the throne rooms of Poseidon and Hades, and then smash open the lock so you can confront Zeus on Mount Olympus.
After you have the Hades Crown and the Trident from Poseidon, use the mirror to travel to the gate of Olympus (lightning bolt symbol at top). Hercules will smash open the lock and you can enter Olympus.
To find Aeolus all you have to do is get through the Mount Olympus gate (Hercules will help you) and then buy the windbag using one golden drachma from Aeolus on the trail to the top of the mountain, which is where you will battle Zeus (later).
There is no key. After Zeus has the 5 sacred items, Hercules will help you go to see Poseidon and Hades, and then he will smash open the padlock on the gate.
After Zeus takes the 5 sacred items, you can get Hercules to help you reach the throne rooms of Hades and Poseidon. Once you have the crown and the trident, you can go to battle Zeus on Mount Olympus. Transport Hercules to the gate and he will smash open the padlock. (*before going to Olympus, you will need the drachma coin from cleaning Hades' temple)
You have to get Hercules to open it.
When you have returned the 5 sacred items, Zeus steals them. Hercules will help you reach the throne rooms of Poseidon and Hades, and can open the lock on the Mount Olympus gate.
hes a god
When you convince Hercules he smashes the lock for you
You can't without him.
The gate to Mount Olympus is only opened late in the game, after Zeus has taken the five sacred items and Hercules has helped you obtain the Hades Crown and Poseidon's Trident. At that point, Hercules smashes open the padlock.
After you pass the gates you will have to battle Zeus and after that you will win the island medallion from his daughter.
You buy one with the one drachma coin that you earn by cleaning graffiti from the Temple of Hades. Once you pass the Olympus gate (late in the game), you will find the Wind Wagon run by Aeolus. Buy a windbag to travel up to the top of Mount Olympus, where you will battle Zeus.