A "lock-in" is when a pub owner lets drinkers stay in the pub after the legal closing time, on the theory that once the doors are locked, it becomes a private party rather than a pub. Patrons may put money behind the bar before official closing time, and redeem their drinks during the lock-in so no drinks are technically sold after closing time. The origin of the British lock-in was a reaction to 1915 changes in the licensing laws in England and Wales, which curtailed opening hours to stop factory workers from turning up drunk and harming the war effort. Since 1915, the UK licensing laws had changed very little, with comparatively early closing times. The tradition of the lock-in therefore remained. Since the implementation of Licensing Act 2003, premises in England and Wales may apply to extend their opening hours beyond 11 pm, allowing round-the-clock drinking and removing much of the need for lock-ins. Since the smoking ban, some establishments operated a lock-in during which the remaining patrons could smoke without repercussions but, unlike drinking lock-ins, allowing smoking in a pub was still a prosecutable offence.