Exclusive LOCK on a physical file

I do ALCOBJ OBJ((QCLSRC *FILE *EXCL))

This doesn't specify a member, but it appears to put an *EXCL lock on only the first member.

WRKOBJLCK OBJ(QCLSRC) OBJTYPE(*FILE) shows just a *SHRRD lock, even though I asked for *EXCL:
Job User Lock Status Scope
QPAD155152 LENNONS *SHRRD HELD *JOB

WRKOBJLCK OBJ(QCLSRC) OBJTYPE(*FILE) MBR(*ALL) shows an *EXCL member lock on the first member:
Member Job User Type Lock Status
CRPGDEBUG QPAD155152 LENNONS MBR *SHRRD HELD
DATA *EXCL HELD

But I can still update other member, e.g., through PDM/SEU.

Is there a way to lock all members in a file with ALCOBJ? (Without looping through all members and doing It individually that is.)