Above is a photograph of a typical elevator electrical door interlock assembly - minus the protection. The voltage running through the contacts in that switch is 230V. NORMALLY there is a cover over this switch to prevent accidental contact and to keep the contacts free of dust and dirt. Yes, this switch is accessible to anybody who lets curiosity get the better of them and reaches up to see what it is. And yes, contact with voltage that high can theoretically kill you.

Is a moral to the story really necessary here?