Locked yourself out of the house? Most common pin and tumbler locks can be picked with a little luck and finesse so before you call for help try this out... and please don't try to pick other peoples locks with this technique.
1) Get a paperclip
Get a paperclip or safety pin and bend it straight. Now make a slight upwards bend at the tip.
You can also buy a lock pick set if you choose to make this task easier. They are sold at almost all hardware stores.
2) Insert the wrench
Insert your wrench into the lower part of the keyhole—that is, the side opposite the one where the key's teeth would go in.
3) Determine direction
Figure out which way the lock needs to be turned to open by turning the wrench clockwise and then counterclockwise. You'll feel which way has more leeway.
4) Turn the lock
Turn the lock the right way with the wrench, putting little pressure on it. Make sure to hold the wrench in place.
5) Insert the paperclip
While keeping pressure on the lock, insert the end of the paperclip into the top part of the keyhole.
6) Feel for the pins
Feel around the keyhole with the paperclip until you locate the pins. If you're picking a common door lock, there will most likely be at least five of them in a row.
7) Push up
Now for the actual "picking." One at a time, push each pin up with the paperclip. Try to feel for the moment when the pin reaches its "unlocked" position. You should feel a slight give or even hear a faint click. Always start with the pin furthest away and move closer.
8) Increase the pressure
As you go, apply slightly more pressure with the wrench until you have all the pins lifted up.
9) Turn the wrench
Now turn the wrench and it should open!
It is so much easier if you have tools...