Fortunately, this is often an easy fix. Simply grab a can of WD-40, silicon-based lubricant, graphite spray, or a dry lubricant and spray it into the keyway. Once it has been sprayed, insert the key so the lubricant will work into the locking mechanism.
Lock is stiff and difficult to open
Dirt and dust can sometimes find its way into a lock and build up over time. This can clog up the locking mechanism making it difficult to turn.
You certainly can use WD-40 in a lock, but you shouldn't. Almost all locks are designed and fabricated to operate without lubrication. If you add an oil or grease to them, that will serve to collect dust and dirt and increase wear on the lock, encouraging it to jam up.
Do not put liquid, eg. WD-40, in there, it will only stick more dirt and dust in the lock. Instead use powdered graphite, or 'write' on the key with a graphite pencil, then work that into the lock with the key. It will loosen right up.
Graphite powder is the preferred lubricant for locks. You should be able to get it at any hardware store in a squeeze bottle that is half air, allowing you to blow it right into the keyway. You are going to have to wait a while before putting it on, as the residual WD-40 will gum it up.
WD-40 silicone vs WD-40
It is silicon based. A lot of people use WD-40 just the basic one. It is a penetrating oil, It is not a lock lubricant. But for sticky locks or or a lock that's jammed up on you WD-40 is is a nice start because it's a penetrating oil but it does not lubricate your lock.
The issue most homeowners face with their locks is that the key jams in the lock and is hard to pull back out. Usually, this happens when the lock pins are dirty or need to be lubricated. Common causes of this include corrosion, rust, and a build-up of dirt and debris.
If you do want to attempt to fix this issue yourself, you can try using powdered graphite or a graphite spray. Coat your key in graphite and insert it into the keyhole. The graphite will act as a lubricant to help unjam lock tumblers that may have become clogged with debris over time.
Oil, plus the environment – you don't want that in your lock, so you'll want to use a graphite or silicone spray rather than your regular WD-40 or other oil-based lubricants. WD-40 does make a product specifically for locks, WD-40 Specialist Dry Lubricant and we also like 3-IN-ONE's Lock Dry Lube.
Don't use oil.
Oil might assist the moving parts of the motor in your car, but it is never a good idea to squirt it in a stiff lock. The oil will just combine with any grime already in the mechanism and compound the situation.
If you have a stuck lock, you should first check the keys to your door. Look for any breaks or burrs as a sign of a broken key. You should also inspect inside the keyhole to check whether any broken pieces are stuck in the lock if you have a broken key.
Try graphite powder instead.
It typically comes in a squeeze bottle or tube with a needle-nosed applicator to provide ease of use. Just gently squeeze a very small amount of graphite powder into the keyhole, and then use your key to slowly work the lubricant into the lock.
Wrap rubber bands around a door or drawer knob to create a non-slip surface. You will use less grip force on the knob.
To lubricate the lock Safestyle recommends using graphite powder, the fine particles mean less residue than oils or sprays which can also be sensitive to hot or cold conditions. Put a little amount of graphite powder inside the door lock to ease any friction inside, making sure not to put in too much.
Another possible cause of a stiff lock is dirt buildup on the tumblers inside the lock cylinder. When dirt builds up inside these tumblers, they may become stuck together, preventing them from moving freely when you try to turn your key or insert it into the lock.
Use powdered graphite, Teflon, or PTFE-based lubricants like WD-40 Dry Lube to clear away any gunk or debris stuck in the lock. Slide your key in and out of the lock to spread the lubricant around the lock. Reapply lubricate once every season to keep your locks gunk-free.
Grime buildup: Heavy areas of grime on door frames can also make it stick. Squeaky hinges: Evidence that oiling or replacing the hinges can help fix a sticky door. Loose screws: If the screws on the door jamb are loose, they can make the door hard to open in winter and summer.
And since a solvent doesn't evaporate well, as a double whammy it lingers to gunk up your keyhole too, attracting dust and dirt to make everything worse still. So again, for your own sake, no WD40. What you should use for a sticky lock is a teflon based PTFE lubricant.
What's the best lubricant for your lock? When choosing the best product to lubricate locks, dry lubricants like graphite powder and PTFE lubricants are best. As mentioned above, oil-based products can attract dust and dirt which can damage the delicate internal mechanism of your lock.
Use a can of compressed air or a small brush to clean the keyhole thoroughly. Lubricate the lock: Sticky locks are often due to a lack of lubrication. Apply a graphite-based or silicone-based lubricant specifically designed for locks. Avoid using oil-based lubricants as they can attract more dust and grime.