The best replacement for central locking is power door locks.

The best alternatives to central locking are rated as following:
★★★★★  power door locks
★★★★  remote locking
★★  keyless entry

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Speaking about central locking, one probably shouldn't forget about alarm.

Other search terms related to central locking and their ratings are:
★★★★★ alarm
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Google Trends

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central locking
power door locks
remote locking