Investigate the bodies

Deciding to be proactive and searching the remains of both the skeleton and the rat. You slide off your bed and get onto your knee's. Ignoring the feeling of the rough floor on your knees, you feel around the skeleton and manage to find a bronze key, but unfortunetly nothing else.

Moving onto the rat, you find the meat of the rodent badly gone off, a foul smell emanating from it. Unsure exactly what the rat died of, you're careful in examining it. The only thing worth of interest being a few bones you think small enough to be of use at some point.

Almost immediatly after wiping your hands off onto your bed matress, you search for the lock of the bars, trying the key you find it not matching the lock. But struck with inspiration, you decide to try and use one of the rat bones to pick the lock.

the two bones vary in size slightly, one slightly large than the other. Which one would be best?

Health: 100%
Tiredness: 0%
Hunger: 2%

Inventory:
Small Rat bone
Large Rat bone
Bronze key