Police were called to the Casbah incident in Horsham Road at around 11.25pm on December 16.
Sussex Police said a member of staff was preparing to close for the evening when two masked men – both armed with knives – entered the store and immediately walked behind the counter.
They began taking bottles of liquor from the shelf and cash from the till, and the worker suffered a small cut to the head as he tried to intervene, police added.
A few days later Thomas Penny, 18, of Brighton Road, Redhill, Surrey, was arrested in an unrelated matter in Dorking, Surrey.
After investigating this case, the police were able to link him to Crawley’s aggravated burglary; further examination also revealed that he had searched the internet with the words “Crawley stabbing”.
He was later charged with aggravated burglary. He pleaded guilty to the offense and, at Lewes Crown Court on Friday June 10, he was sentenced to five years in a young offenders’ institution.
The second suspect has not been found and remains unresolved, Sussex Police added.