Does the schematic symbol give you any ideas?
When you push it down, it breaks the connection.
There are a zillion types of switches, I doubt very much that you need to re-invent the wheel (or N.C. switch in this case).
If I have misunderstood and your intent is simply to reverse the action of a N.O. switch to normally closed, one method is to use a relay such as the OMI-SH-112D,394 12VDC relay linked above. It draws 60mA on the coil, so any small wall wart with a 12VDC output will work to supply the coil current. The contacts are capable of switching 10A at 250VAC, so they should more than suffice. I like this style more than some slightly cheaper models because the coil pins are well separated from the (mains voltage) contact pins, which helps for safety.
The relay coil will draw current continuously to hold the contact off. That, I think, is the simplest. A low voltage coil relay could be used which could mean that your switch would be touch-safe (assuming a wall wart supply or other isolated supply was used).
That may not be acceptable due to the current draw. The light could be driven with a solid state switch that would be turned on when the switch is opened. For example a small SSR with a pullup resistor to (say) 12V that is shunted or by the switch closing.
Having at least a few mA through a switch can help improve the reliability. If the above does not adequately answer your question for some reason, please explain why and I'll attempt to adapt the answer.