Lightning is a naturally occurring electrostatic discharge during which two electrically charged regions in the atmosphere or ground temporarily equalize themselves, causing the instantaneous release of as much as one giga joule of energy.
Attracting a lightning bolt would take much more sophisticated equipment than an iron key at the end of a silk string. Tall metallic rods extending high above the ground would do the trick, drawing any electrical charges in the atmosphere and directing them into a facility.
But robust and dependable safety mechanisms would also need to be built to immediately contain the huge burst of energy and prevent the entire facility from being blown to bits.
And even during a thunderstorm it’s incredibly difficult to predict when and where lightning will strike.
Assuming that you are lucky and get a lightning bolt to hit your conductor, there would be major difficulties in storing the energy and then converting it to alternating current so it can run your appliances. In addition, any solution to these problems would need to be able to withstand the enormous surges in energy generated by each strike.

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