If you live east of Federal Highway anywhere from Highland Beach down to Pompano, you already know the salt air gets into everything. Car paint, patio furniture, the AC unit. Locks are no different, except you don't see the damage until the day the key won't turn.
A big share of the coastal lock calls I get aren't really lockouts or break-ins. They're locks that slowly seized up over a couple of years and finally quit. Most of that is preventable.
What salt actually does inside a lock
A pin tumbler lock is a row of tiny brass pins and springs sitting in a cylinder with clearances measured in thousandths of an inch. Salty, humid air settles in through the keyway, and the salt pulls moisture out of the air and holds it there. That moisture corrodes the springs first, because they're thin steel. A weak or rusted spring means a pin that doesn't drop back into place, and that's when the key starts to stick, or turns only after you jiggle it.
Meanwhile the outside finish pits and the deadbolt's moving parts start to grind. The latch gets lazy. Eventually something breaks: a spring, a key, or the bolt stuck halfway out.
The early warning signs
- You have to jiggle the key or pull it out slightly before it'll turn.
- The key feels gritty going in, or comes out with a dark or green residue on it.
- The deadbolt needs a shove on the door to throw all the way.
- White or green crust around the keyway or on the latch.
Any one of these means the lock is on its way out. Caught now, it's usually a cleaning and a fresh cylinder at most. Ignored, it tends to fail at the worst possible time, like with a key snapped off inside it.
The lubricant mistake almost everyone makes
The instinct is to spray it with WD-40. Here's the problem: it's mostly a solvent and water displacer, not a long-term lubricant. It loosens things up for a week, then the light oil left behind attracts the same salt and sand you were fighting, and turns it into paste inside the cylinder.
What I recommend instead:
- A dry lubricant made for locks, either graphite or a dry PTFE (Teflon) spray. These don't leave a sticky film for grit to cling to.
- A small amount, a couple of times a year. Spray once into the keyway, then work the key in and out and turn it several times to spread it.
- Don't mix them. If someone already used an oil, a graphite powder on top makes a sludge. Better to have the cylinder cleaned out first.
Hardware that holds up better near the ocean
When it's time to replace, finish and materials matter more here than inland. Solid brass and stainless hardware with a quality finish handle salt far better than plated zinc, which is what a lot of budget big-box locks are made of. If you're on the water, it's worth spending on the better grade. It pays for itself the first time you don't have to replace it.
Smart locks need a little extra thought too. Keypads on a front door that faces the ocean take direct spray, so a model with a proper weather rating and a covered location helps. I wrote more on that in the best smart locks for South Florida homes.
Don't forget the locks you only use once a year
Hurricane shutter locks, side gates, pool gates and the back door nobody uses are the ones that seize worst, because nobody notices until they need them. The week a storm gets named is the worst time to discover the shutter lock won't turn. Work them every few months and give them the same dry lube. If they're already frozen, we handle hurricane shutter locks and keys too.
Fix it or replace it?
If the lock still turns with some effort, it can often be cleaned, lubricated and rekeyed, keeping the hardware you have. If the bolt is binding, the finish is badly pitted or springs have already broken, a new cylinder or a new lock makes more sense. I'll tell you honestly which one it is, and give you the price before I start. Either way you get a 1-year parts and labor warranty. See our rekeying and lock change pages for what each job involves.