ALOHOMORA

YES! A SPELL TO OPEN EVERY DOOR!

LUCKILY HARRY TALKS IN HIS DREAM, SO RON COULD EVEN SAY IT IN PARSELTOUNGE, AND WITH THAT YOU MANAGED TO OPEN THE CHAMBER OF SECRETS AND GET
TOM RIDDLE'S DIARY!

 VOLDEMORT NEEDS TO BE ON THE LOOKOUT IF YOU GO THAT WAY!

Note:
The green key is on one of the yellow key's side
The value of the green key is 1