Flashlight and Key / Lighting

Often work to the people who go home at night,because the corridors in the dark to find his house key to be impatient.Not only because in the dark to find the key from the bunch of keys,also find the keyhole.Why not find a more convenient way to enter the house?
How to put the key in flashlight?This small LED flashlight is designed for that the people to regular home late and the house door no light,just need a house key into the flashlight,when the night to open the door that launched from the flashlight in that key,and the LED light irradiation can be very convenient to find the keyhole,also not for the key,very convenient.