Key talismans are very potent and should be used whenever there is a new door/aspect of life that is to be unlocked. For example to find a new job, or open doors for you in the current one, or more directly when trying to find a new/better place to live.

Take a small metal key and place it before you on your alter, and either write the name of the person you wish to benefit on a piece of paper that is beneath the key or concentrate upon the image of them in your mind while you say the incantation necessary.

Here are two sample incantations that I had written in one of my notebooks.

To find work:

Key, key, you are the power through the Lord and of the Lady, here in me, and here I say,
Give this [man/woman] [name] the employment he/she desires.
Open the door of good for them
Open the door of their desire
Open the door,
Let it beopen,
Let them enter on that work which satisfies their need and will,
Fulfill and bless all of their days
This is your message; this is your aim,
This is your power which now begins.

To find housing:

Key, key, you are the power through the Lord and of the Lady, here in me, and here I say,
Give this [man/woman] [name] the dwelling place of their desire,
A place of blessing, comfort, ease and safety, warm with human good,
And make this place in all ways home to all their needs
This is your message; this is your aim,
This is your power which now begins

You may chose to light a candle and leave the key before it until the candle burns down, select whichever sort you feel is best. The aim of the burning candle is to channel and reinforce the message and potency of the talisman.
To also amplify the energies you can place the key on a reflective surface to reflect the light back through from the other side. The key should be worn by the person it was enchanted for as a pendant either on a thong or a silver colored chain underneath their clothing.
Provided the subject is constantly seeking that which the key was enchanted for things should start to come together in 3-5 weeks, according to my notes.