The main security feature of tubular locks (washing machine, vending machine, etc) is that the pins are arranged in a circular way so that without the key previously picked pins will drop back in to their neighbors holes resulting in having to pick the same lock many times to achieve a full turn.
I was thinking that by using the pen as a mere tensioner, the lock could be picked pin by pin.
Then working in the same principle as slamming a door to remove a tooth, or the opposite of a weed wacker, the pen barrel could be quickly torqued by pulling the two ends of a string.
If you managed to pull it off correctly the pins would quickly jump through the whole cycle and result in instant success.
This method works when the source of torque is a wound spring.
The other idea I had would be to use wire wire around the pen barrel to variably tension a series of Bobby pins. Basically copying a professional tool.
In the same vein I feel that the right thickness of notched paper or foil could achieve the same 'instant' results one gets from a prof tool.
Just some thoughts.
Fuck soda and 7$ laundry