Challenger Garage Door Opener

I have double entry doors on the front of my house. Installed over the double doors are double storm doors that have aluminum frames screwed to brick mould. The hinge side consist of steel shafts that run though nylon bushing - a common "hinge" used in most storm doors. The one storm door that is normally used for entry is sagging on the side opposite the hinges, causing the storm door not to close properly - sag is approx 1/4 inch. The storm doors have been in place for about 25 years and other than this problem the storm doors are fine. Any suggestions on how I could repair the sagging storm door?

Our first born will be here anyday now. I know this is not something I need to worry about for a few months, but has anyone baby-proofed a lever style doorknob?? I have tried looking around at the store but haven't seen anything for them. For closets and such I can just put a latch up higher that baby could not reach, but I am stumped on the basement door and other doors where it would need to "lock" after someone goes through. Any ideas?? thanks.