Nobody can know it all. Nobody can do it all. There is a very good reason that humans are social animals; the ones that couldn't get along with others, compromise, and work in a group died out.

It is good to have a wide diversity of friends with a wide diversity of skills, talents, points of view, knowledge. You never know what might make a difference.

People need to remember that you survive to get back to society. To return to the relative safety of the fold. It is good to get away from people for a time. But you always come back. Often with a renewed appreciation for how good life can be withing a social order and contract.

For future reference: Most interior privacy lock sets have a simple way of disengaging the lock from the other side designed in to handle just that sort of situation. Privacy locks are just there to keep people from inadvertently walking in. With a few easy step, and sometimes a few common tools, they are easy to defeat.

Look closely at the doorknob often there is a hole or what looks like a key slot in the middle. If it is a slot you can usually release the lock by inserting a screwdriver and twisting. If it is a hole the usual method is to insert a stiff piece of wire and thrust it until you hit a latch that releases the lock. Wire from a coat hanger, straightened with pliers, is usually stiff enough. Sometimes the hole you put the wire in is not actually on the knob but near it.

Failing that it is often easy to insert a knife blade and to use the edge to work the bolt out of the striker so the door will open. If the door opens opposite the side you're on it often helps to pry the jamb away from the frame and to work the bolt back by by working between the jamb and the frame.

If the door opens toward the side your on removing the hinge pins should allow you to take the door off the hinges and gain access that way.

Some privacy locks can be released by simply twisting the handle one way, pushing on the door to stop the bolt from sliding back into the striker and repeating the other way.

If a child gets locked in it is best to calm them down, reassure them everything is okay and that they are not in trouble, get them to wipe their hands so they aren't sweaty from panic, then get them to try to turn the handle with both hands. Most privacy locks disengage if the lock-side handle is turned.

It is a good idea for every family to have a short pry-bar or large flat-blade screwdriver to handle prying and wedging jobs. Interior doors are typically light-weight and easy to force once you know how and have done it a few times.