In before I did give the key to my Thai maid and later on I noticed that many BK mamy won't give the key to their maid, so now I allow my new Filipino maid to have the key during her day-off, so she can back home anytime. For the rest of the week, she will only bring the key when she needs to go out for market or bring kid to school, etc. I hang the key in the living room. (I don't know why I'll do in this way now and it seems 多 餘 for my case). Anyway.... I will think it over....
I don't give the key to my maid during weekdays because my mother-in-law is staying with us at the moment and she is the one goes to the market. I only give key to my maid on her holidays so that she could come back whenever she wants.
The reason I don't give the key to her is I don't want her to go out (in case she slip out) as she has to take care of my 9 months old baby. I don't think she needs the key if she does not have to go to the market.
We hang the front gate key in the living room for her to bring our kid to school, etc.
We don't give her the key on her day off. Even she has the copy of the key for the front gate, she still doesn't have the key to our wooden door. She won't be home too early and we won't be home too late anyway (and we don't want her to bring anybody home or clean up our home when we are out). If we arrive home really later than her curfew, we would call her and she would sit in the lobby reading newspaper.