The problem to be treated in this research is the improvement of low productivity in a company. This means that they produce at a lower level than what they can with the capacity and resources they already possess, causing high losses for the company, which is why it is an indicator of great importance. Therefore, this study proposes the improvement of the production process through a model that implements Lean Manufacturing techniques in the line of manufacturing locks in the metalworking company. The study was conducted through the use of engineering tools that diagnosed the current situation and the causes of the problem. Consequently, the techniques to implement are 5's, TPM, Six Sigma and Poka Yoke aiming to reduce defective products, unproductive times and machine downtime in order to improve the level of productivity. The results showed an improvement of productivity improvement of 8 to 12%.