I really like this deadbolt by Probrico, it's so easy to install, comes with two keys. Looks really nice, outside and inside. Fits regular door holes. Price is really good too, not expensive at all. Works really smooth.
Bedroom doorknob. Works great and is easy to install.
OMG this is so nice! I I installed it easily myself within a few minutes and it does the trick, i.e. locking my door so I can do my work from home without interruption from small children who another caretaker is supposed to be watching.