In a pinch, I have used a stout paperclip with a two-millimeter L-bend at the end. The screwdriver method too often damages the bezel.
In practice I remove keys from controllers because of the nonzero risk of bumping the key and changing controller mode when I don't want to.
My keychain includes an SLC/Logix key on a little lanyard, a PLC-5 key, and universal keys for Hyster and Clark forklifts.