Oh yeah if you guys confused here:
1. The Silver Key is under carpet
2. Silver Key only used for left door
3. There's ladder inside in left room
4. And bring the ladder into vent (You need screwdriver)
5. You will find screwdriver behind picture of Ice
6. Use screwdriver on the vents and get the Golden Key
7. You can escape the room (Right Door one) By using Golden Key.