Playing/practicing in the same key all the time is a real tender trap. Since I sing in the key of "G" I most invariably will start playing any and everything in the key of G. I can play in most keys, but not like I can play in the key of G.
In order to break the mold, every time I think about it when I am practicing, I will play the song I'm working on in other keys. I will make it a point to play at least two scales for a few minutes other than G.
Currently I am practicing progressions posted by T-Block. I am also listening to CDs and playing along, matching progressions. I try to read music out of an hymnal for a few minutes each day.
I also practice on song/chord posting from this site every day. I have printed out many of them and placed them in a folder in alphabetical order. That practice has really helped me to learn a good number of (phat) chords as well as a lot of songs, and I can go back to them and practice if I want to use one of them in service.
I have several courses that I work on in some way or other nearly every day. Greg Hannon, Ethel Austin, etc.
All of that usually adds up to at least an hour a day and sometimes up to three if I am working on new or forgotten songs.
berbie