He worked numerous jobs for Laneville Independent School District, during the summer time he would study law at the University of Texas and later passed the bar exam becoming an attorney.

Lock enlisted in the United States Army to fight in World War II, he was a second lieutenant.

He worked 15 years for Southland Paper Mills in Lufkin, Texas.

[2] Lock served Texas House of Representatives District 12 during the 45th, 46th, 47th, 48th, 49th, and 50th Legislatures.

He was President pro tempore of the Texas Senate during part of the 55th legislature.