If your bathroom door has a button lock from the inside and a little hole on the knob on the outside as seen in the above video then a screwdriver can certainly help you out.
How to get into a locked door from the outside.
Slide the long end of a credit card in between the door frame and the locking side of the door just above where the lock enters the frame.
To open it up all you need to do is thread a coat hanger or hooked piece of wire through the top of the door and open the emergency latch which can also be done by the rope many emergency latches.
Angle the card downward and situate it behind the bolt of the lock.
Then turn the door knob and shake the pin which should cause the lock to open.
If this doesn t work put a straightened out bobby pin into the lock.
You re going to need a screwdriver with a skinny rod because the thicker rod won t be able to fit through the hole.
To open a locked bathroom door from the outside place the point of a butter knife into the keyhole if it s a push button lock and turn the knife sideways.