Man pages matching name lockfile in section 1:

lockfile.1.es	debian 10 / manpages-es-extra
lockfile.1.zh_CN	debian 10 / manpages-zh
lockfile.1.zh_TW	debian 10 / manpages-zh
lockfile.1.en	debian 10 / procmail
lockfile.1.es	debian 11 / manpages-es
lockfile.1.zh_CN	debian 11 / manpages-zh
lockfile.1.zh_TW	debian 11 / manpages-zh
lockfile.1.en	debian 11 / procmail
lockfile.1.es	debian 12 / manpages-es
lockfile.1.zh_CN	debian 12 / manpages-zh
lockfile.1.zh_TW	debian 12 / manpages-zh
lockfile.1.en	debian 12 / procmail