I love to think that when he relaxes his arms, the key slowly drifts down over several hours to barely within reach, but as soon as he pulls up on the restraints, the key rapidly slips further up and away, out of his grasp.
I also love to think that eventually after hours of attempts, he figures it all out and then patiently waits and then quickly grasps to obtain the key…only to find that it doesn’t fit any of the locks.