Check to make sure the latch is engaging when turning the key. WD40 or silicone spray on the latch. Work the lock. Key turns no lube needed in key hole. Is the door rubbing on the frame. May need to sand or plane the areas it's rubbing. Check to make sure all the hinge screws are tight.
Recently, a pocket door in my 1958-built home has become very difficult to open from the closed position. Once the door has been moved from the completely-closed pos...
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Try WD-40
spray some WD-40 in the key hole!
Check to make sure the latch is engaging when turning the key. WD40 or silicone spray on the latch. Work the lock. Key turns no lube needed in key hole. Is the door rubbing on the frame. May need to sand or plane the areas it's rubbing. Check to make sure all the hinge screws are tight.
Use lock de-icer costs about$2 at walmart in the auto area and you can carry it in your purse, it's no larger than the mini eyeglass cleaner
I use Graphite Lubricant. It is a powder in a tube that you can squirt into the hole and/or put on the key! (Much like pencil lead.}
try some WD40
Do not use WD-40. It attracts dirt and dust and will be a very temporary solution at best. Use a dry graphite powder.
graphite sprayed in lock