No it really didn't. There's been shoplifting for decades, long before self serve tills, and even long before self-service supermarkets. We had an old fashioned newsagents in the 1970s - counter served basically everything. Anything of any value behind the counter or within the glass topped counters, i.e. cigarettes, tobacco, alcohol, boxes of chocolates, fancy pens, lighters, etc. We also had locked display cabinets in the shop floor itself for "fancy goods". Obviously, we had things "on" the counter too, such as chocolate bars, and newspaper/magazine racks, but we still had the most expensive magazines on a different rack behind the counter.
Customers would come in and ask for cigarettes, etc and would just snatch them and walk out without paying - very blatant, even back in the 70s.
Similarly, those who played the "cash tricks", i.e. fooled you at busy times by playing silly beggars giving you a big note, then asking for it back to give a smaller note, then their companion would give a note instead, all a "con job/trick" to confuse and fool us serving them - like a fairground trick, and also distraction tricks too when they come in small groups and distract you whilst others filled their pockets.
I've no doubt that self service tills make it worse, but let's not pretend that shoplifting is anything new.
The biggest factor is the way that everyone knows the police and courts won't bother with anything under £200. That's given green light for the thieves (which is what they are), to be more blatant and increased shoplifting (and increase risk of assault on staff etc).