Replacement Patio Door handles

Hi! I am interested in replacing my sliding patio door handles with ones that are keyed so that I can have easier access to my home and a more protected environment. As it is now, it's your standard patio sliding door that they install in condominiums. the measurement of the handle is 9 1/2", the measurement of the locked part is approx. 5 3/4". I'm just not too sure which one I should get. It's an Acorn-Wal hardware. I don't care about the color - I just want one that has a key so I can lock and unlock it from the outside. Thanks!