Want To Change The Cabinet Knob

One of my friends is a kitchen cabinet supplier. My kitchen cabinet was bought and installed by him six years ago. I am thinking to ask him is there any other new cabinet knobs is match with the kitchen cabinet or not, because I am thinking to change all the knobs to a new design. I have to get the cabinet knobs with lock to stop my daughter keeps open the cabinet and dig out all my utensil to play. I wonder is there any knobs come with lock?