What type of lubricant should be used on a lock that won't open, after confirming the keyway is clear?

Using molybdenum disulfide as a lubricant on a lock that won't open is advisable due to its unique properties. Molybdenum disulfide is a solid lubricant that forms a protective film on the metal surfaces, which significantly reduces friction. This is particularly useful in locks because it can penetrate into tight spaces, ensuring that the internal mechanisms of the lock are adequately lubricated without attracting dirt and grime, which can occur with other types of lubricants.

Additionally, molybdenum disulfide is resistant to high pressures and extreme conditions, making it suitable for situations where a lock may be subjected to varying environmental factors. While other lubricants, like oil-based options, can sometimes provide short-term relief, they often do not have the same longevity and can gum up or dry out, potentially worsening the sticking issue. Thus, in the context of maintaining lock functionality and ensuring smooth operation, molybdenum disulfide stands out as an ideal choice.