Cal-Royal NM Series, Extra Heavy Duty Mortise Locks, Grade 1 - FACULTY RESTROOM LOCK Mul-t-lock MT5+ Euro Profile Double Cylinder (33 x 33mm) the TTW-2015 weighs 105 lbs

the TTW-2015 weighs 105 lbs and comes with one removable and adjustable shelf

or other secure location

MUL-T-LOCK manufacturers a vast array of Mortise Cylinders

Because it is mechanical

Cal-Royal NM Series, Extra Heavy Duty Mortise Locks, Grade 1 - FACULTY RESTROOM LOCK Mul-t-lock MT5+ Euro Profile Double Cylinder (33 x 33mm) the TTW-2015 weighs 105 lbsLatch bolt retracted by knob lever from either side unless outside is made inoperative by key outside or by rotating inside thumbturn. Outside knob lever unlocked by key outside or thumbturn. Rotating inside knob lever simultaneously retracts latch bolt and unlocks outside knob lever. Auxiliary latch deadlocks bolt when door is locked. Inside knob lever is always free of immediate egress.