Shake your phone to drop the keys on the floor, then grab the key and use it to open the chamber level 6.
At level 7 this you have to move your finger 4 times to the right and to the left. First press the door and slide your finger from left to right
then from right to left
from right to left
from left to right
and the door will open.
Now continue to the 100 Chambers Level 8 Explanation, or back to the 100 Chambers Level 1-5 Explanation