No money? As in, not even a credit card? Often, you can call a locksmith and they can bill you or take a card right there. You don't normally need to pay cash.
Usually, it requires something like a wire with a hook on the end, and being able to lift up the locking mechanism. But you can't do this if you don't know where the locking mechanism is. If you screw up break the lock or something in the window mechanism, you void the warranty.