remote centrol locking

my centrol locking has gone on the sri not a major problem but looked at it and i cant be bothered to try sort it so was thinking on just buying a cheap kit with remote like this

http//:cgi.ebay.co.uk/nova-remote-centrol-locking

i know there nothing great but the last type i got years ago for mk2 astra you could pop it by smacking it and been told cheap set ups like this the old (half tennis ball trick) opens it lol

true ??