A woman who forced a disabled pensioner to hand over her keys and stole her car has been charged by police.

At around 3pm on June 24, WA police said the woman knocked on the door of a home in Kewdale.

A 74-year-old woman answered, and the woman asked for a glass of water.

The woman was tricked by the thief when she went to get her a glass of water.

The elderly woman left the front door to get her water, and when she came back, she found the woman inside her house.