I know, everyone wants a brand new system, but until then:
Say you make 40k and are due for a 5% raise each March.
In January, start applying for jobs like crazy. Tell them you make 45k (lie #1) so you're hoping for that salary or higher. Let's say two of them offer you 50k.
Tell your current employer you appreciate the 5% raise to 42k and you do enjoy the company, but you have student loans or or child support or whatever to pay so you don't have a choice but to leave and take the 55k offer (lie #2) from elsewhere. Let's say they offer to match the (fake) 55k offer.
Now you go back to the offers an tell them the same story, their company looks very interesting blahblah but you don't have a choice but to go for the bigger salary, and that your company offered to beat their offer by counter-offering 60k (lie #3).
Worse case: If they turn you down, you just went from 42k to 55k. (I have done this THREE years in a row now. Everyone says never accept counter offers but that's simply bullshit internet advice)
Best case: They match or even beat the counter offer and you just went from 42k to 60k+. That is 50% raise compared to the original 5%.