We got a call from a woman who lives in Pelham Parkway Bronx zip code 10462. She had locked herself out and wanted an experienced licensed locksmith to open the door .we had to remove the old lock to enable us replace it with a new one. The lock had concealed screws which we removed. We removed the retaining button which is used to hold the inside knob and turned the knob forward and backward. We used a small nail and a piece of wire to depress the button and push the whole. We carefully removed the faceplate and unscrewed the last two screws. This removed the old lock and the lady gave us the new locks she wanted us to fit. It took us 10 minutes to have the new schlage door locks fitted.