PaulS:
how do I do it most easily?
If the servo starts at 0, and rotates to 180(ish) to unlock:
lockServo.write(180);
delay(howeverLongYouWant);
lockServo.write(0);
If the servo starts at 180, and rotates to 0 to unlock, swap the first and third lines.
Falls off chair in amazement !
PaulS used the delay() command in a program. 
Whatever next, code on the same line as an opening brace ?
As requested, though, it is the easiest way to do it, if not the best.