tried the lock at rear side
i guess its the stand is supposed to be facing downward right?
if so then u can use the lock only at front left n rear right side
i tried at rear left,stand was facing upward,it did locked but it was a little hard,since it was dark,couldnt see where to put the rod n then u have to hold the lock with rim while finding the hole n then swing it
where as on right rear side,because of stand it had a support so was bit easier
i guess with time it'll take a lot less 
though on front wheel it was alot quicker n it was the first time too :o