Snake in the house

Walking out of my bedroom and i see this little black snake poke its head out under the door of my water heater closet. Small thing and not scared of it as it obviously non-venomous. The problem is that i converted a garage to a the bedroom. I built a support system to allow me to level the floor . I built a small closet for the water heater but since that was an out of sight spot and i was short about 4 in of plywood ..i left a gap with access to under the floor. Im pretty sure the snake came in through a hole drilled in the exterior wall that was used for a generator (breaker box is in same closet) so....the snake can be anywhere in the closet or....under the floor. I called a wildlife trapper and he advised $400 to set out traps for 3 weeks. I see the glue traps online but is there something proven that will draw the snake out so i can get rid of it?