Apply this trick only for your hostel room, lest you will get into trouble with the police 🙂
I have a de-humidifer cabinet storing my cameras and handycam, also a seldomly open cuboard drawer, both the keys had been lost. Calling a locksmith would cost $50 per visit, open them by force would damage both, it is then useful to apply this trick on the locks.
Also remember not to open other stranger’s lock – even if you are invited by a friend – you never know he is a thief making use of your talent to steal ! 盗亦有道也!