Koh Chwee Lye is a locksmith at 31 Defu Lane 10 in Hougang, Singapore, with a 5.0 Google rating from its one review. A good locksmith's work goes well beyond letting you back in when the door shuts behind you. After moving into a resale flat, having the locks rekeyed rather than replaced costs far less and keeps old keys from working. On a lockout, a skilled hand opens most locks without drilling, so be wary of anyone quick to reach for the drill. Cutting keys for roller shutters, padlocks and storerooms keeps the units of estates like Defu moving, and many locksmiths now fit and service the digital locks increasingly common on Singapore front doors. Ask what a job costs, call-out included, before work begins. Tucked into the Defu industrial estate, Koh Chwee Lye is the sort of neighbourhood number worth saving in your phone before the day you need it.