I have the following Titan Quick-Read Tape Measures:

12 ft x 5/8 inch  will not lock

25 ft x 1 inch  will not lock

33 ft x 1 inch will not lock

None of the Titan Quick-Read tapes will lock the tape in place when the tape is extended out from the tape container.  I donated all to a charity.  I do NOT recommend this brand; a total waste of money.

What I do have that works are the following:

12 foot Stanley Write-On  – no problem

12 foot Stanley Power Lock – no problem.

25 foot Craftsman 939455 – no problem