I currently have old doors that need to be painted; at least five doors that need new doorknobs.  The "antique" doors (dating pre 1930's and code for 'old') mortise locks have a cutout in the wood so you can't just pop a new one on from Home Depot.  That'd be too easy!  So after a six-month renovation when the contractors start talking about hundreds for each knob/lock or maybe new solid wood panel doors (you wouldn't want to mess with the integrity of the house), to keep sanity you say to yourself "I'll get to it" and now it's been almost 2 years.  So people get stuck in our bathroom if they close the door too tight!  :)  But maybe you've inspired me.  I'll keep you posted.  We all need fresh flowers and locks on bathroom doors!